The best Fire cements, compared.
Top pick: Bostik fire cement 2 kg buff Best value: Vitcas fire cement 500 g buff – Lowest shelf price among badge-eligible listings, at about £5.27, with 4.5 from 480 reviews. Updated October 2026.
Fire cement is a ready-mixed paste for small rigid repairs and joints on indoor fireplaces, solid-fuel stoves, ranges, boilers and internal flues. In the UK you mostly fill a cracked firebrick or seal a stove collar. You tell a suitable tub or cartridge by the joint, the place, the colour, the pack you will finish, and the temperature printed as a ceiling for the paste. The joint comes first. A hairline crack wants paste in the gap. The first flue joint by a stove often wants rope, then cement over it. A door channel wants rope. Laying firebricks wants refractory mortar, not a thick render of this paste. Those checks are in the [fire cement buying guide](/hub/paints-and-varnishes/fire-cement/sub/fire-cement-buying-guide). Indoor paste is the default. Wet exteriors, immersion, moving metal and large voids are the wrong job. Buff or grey suits pale brick. Black suits a dark stove, and it is not a hotter grade. A higher number on the tub is not a safer appliance. A neat joint is not a building-regulations certificate.
Fire cement is a ready-mixed paste for small rigid repairs and joints on indoor fireplaces, solid-fuel stoves, ranges, boilers and internal flues. In the UK you mostly fill a cracked firebrick or seal a stove collar.
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Personal buying guide
Question 1 of 2
What are you repairing?
Bostik fire cement 2 kg buff is £10.14, model 30812576, rated 4.6 from 133 reviews on the saved amazon.co.uk listing. A bullet says up to 1400°C, indoor applications only, and no asbestos. The water field says water resistant, which conflicts with that indoor-only bullet, so follow the bullet if the two disagree. In 32 UK reviews people filled a firebrick crack and used the fire again, filled chiminea cracks and then painted them, and stuck crumbling fire stone, though that set was slow. It is hard to spread on a fireplace surround until the surface is sprayed. One buyer said they had picked the wrong product for a small repair. The saved review texts match the pack-of-two listing, so 4.6 from 133 is not a second sample. The 1400°C figure is the ceiling printed on this listing, not a ranked safety test against the 1250°C tubs.
Pros
Cons
Best for: An indoor buff repair around 2 kg where the 1400°C bullet is the figure you need on the listing.
Less suitable: Outdoor or wet work if you follow the indoor-only bullet, a black metal joint, or a hairline crack that does not need 2 kg.
Specifications
Common questions
What temperature and place does the listing state?
A bullet says up to +1400°C and suitable for indoor applications only, with no asbestos. The water field says water resistant, which conflicts with the indoor-only bullet.
Is the 4.6 from 133 unique to this tub?
The saved review texts match the pack-of-two listing, including the same names and dates. Do not read 133 as two separate studies.
What do those reviews repeat?
Praise is filled firebrick and chiminea cracks. A complaint is that it was hard to spread on a surround until the surface was sprayed, and that it sets slowly.
The Bostik listing at £23.12 is two 5 kg buff tubs, 10 kg in total, model 30812577, with 1400°C on the title. The star line is 4.6 from 133 reviews, and the 32 saved UK texts are the same bodies as the 2 kg tub, including the same praise for firebrick cracks, chimineas, and fire stone. None of those texts is about receiving two tubs. Stiff spreading until the surface is wetted, and a slow set, are the complaints carried over from that shared file. The water field is empty. Treat the score of 85 as the shared 2 kg sample, not fresh evidence for a 10 kg pack. Buy the pair only if you will use about 10 kg of buff paste indoors before the tubs dry. A small crack does not need this pack, and the 2 kg tub is £10.14 if that is the job.
Pros
Cons
Best for: A buyer who will use about 10 kg of buff paste and accepts that the star line is shared with the 2 kg listing.
Less suitable: A small repair, or anyone treating 4.6 from 133 as fresh evidence for this pack size.
Specifications
Common questions
What is in the pack?
The title says buff fire cement, 5 kg, pack of 2, up to 1400°C. Item weight is 10 kg. Number of pieces is 2. Model 30812577.
Are the 133 reviews about this twin pack?
The saved UK texts are the same as the 2 kg tub, including the same reviewers and dates. The stars are not an independent sample for the twin pack.
Hotspot fire cement is £6.35 with 4.6 stars from 65 reviews, and the title says a 310 ml cartridge in black or buff. The saved fields do not agree: item weight is 0.35 g, item form says powder, the colour field says black, and the item type says buff. There is no degree figure. The water field says not water resistant, and the cure-time field says 1 day. That unusable weight is why this listing has no badge. In 12 UK reviews, small vermiculite-liner cracks held after cleaning, a little water, and a gentle first fire, and a rear firebrick was rebuilt in place. The same file includes a pizza-oven repair that crumbled to dust until it was heat-treated promptly, bubbling on a wood-burner chimney pipe, and colour that came out light grey and then went black, or the reverse. Buy it only if you can see the cartridge in front of you and ignore the 0.35 g weight field.
Pros
Cons
Best for: Only if you can see the actual cartridge colour and ignore the 0.35 g weight field.
Less suitable: Any comparison that needs a reliable weight, a single colour, or a stated temperature.
Specifications
Common questions
Can you trust the weight and colour?
No. Item weight says 0.35 g, item form says powder, the colour field says black, the item type says buff, and the title says black or buff in 310 ml. No degree figure is printed.
What do the saved UK reviews repeat?
Twelve UK reviews include a liner repair that held after a small then larger fire, a pizza-oven repair that crumbled until it was heated, and bubbling on a chimney pipe.
Across 6,926 amazon.co.uk reviews, the Vitcas black fire cement 310 ml cartridge is the listing people use for fine cracks, stove seals, and flue joints. At £5.99 it matches the 500 g black pot on price and on 4.5 stars, and the larger review count is why it is the top pick in this comparison. The title states 1250°C. The saved water field says it is not water resistant, and the cure-time field says 3 days. In the first 50 UK reviews, the paste guns into narrow gaps and sets hard around wood-burner seals and gas-fire surrounds. The black does not stay black: reviewers describe it turning grey or white after heat, and one said an older black seal kept its colour longer. Used as grout on a flat hearth it runs, so a later colour touch-up is part of the job if the look matters. The score of 93 is stars plus review volume, not a fire test, and the container field says pail while the title and included components say a cartridge with a nozzle.
Pros
Cons
Best for: A narrow indoor stove or flue joint you can reach with a sealant gun, if a colour shift after heat is acceptable.
Less suitable: A repair that must stay deep black, an outdoor wet joint, or a job that needs kilograms of paste.
Specifications
Common questions
Does this listing state a temperature?
The title states 1250°C. The water field says not water resistant, and the cure-time field says 3 days.
Is it a tub or a cartridge?
The title, item type, and included components say a 310 ml cartridge with nozzle. The container-type field says pail, so that field conflicts.
What do the saved UK reviews repeat?
In the first 50 UK reviews, easy crack and flue repairs are the main praise. Colour turning grey or white after heat is the main complaint.
The Vitcas black fire cement 500 g pot is £5.99 on the saved amazon.co.uk listing, with 4.5 stars from 3,003 reviews. In the first 50 UK reviews it is used on stove-pipe and flue joints, and one buyer stuck a broken log-burner baffle back together. The paste is malleable and then goes rock hard; gloves and a damp cloth are how reviewers smooth the finish. This saved file does not print a degree figure, though the listing says heat resistant for fireplaces, ovens, boilers, and fireclay bricks. The water field says water resistant and the cure-time field says 4 hours, while one reviewer says the tub itself says not for outdoors. The black fades towards white or grey after heat, leftover paste in an opened pot goes hard, and it can crack slightly as it dries. The score of 93 ties the 310 ml cartridge, which has more reviews, so this pot is the small-tub alternative if you want a knife rather than a sealant gun.
Pros
Cons
Best for: A small black patch or flue touch-up from a pot, if fade and a short pot life after opening are acceptable.
Less suitable: A job that must stay black, a large rebuild, or outdoor use if you follow the tub note reported in reviews.
Specifications
Common questions
What temperature does this listing print?
This saved file does not print a degree figure. It says heat resistant and names fireplaces, ovens, boilers, and fireclay bricks.
What pack is it?
A 500 g pot of black paste. Item weight is 500 g. Cure time on the listing is 4 hours, and the water field says water resistant.
What do the saved UK reviews repeat?
Praise centres on flue joints and a hard set. Complaints centre on the black colour fading and leftover paste hardening in the pot. One review says the tub itself says not for outdoors.
Vitcas fire cement 500 g buff is the lowest shelf price in this set among listings with at least 50 reviews and a usable weight: £5.27, with 4.5 stars from 480 reviews. That cash-price rule is why it is the best value here, not a heat test. A 5 kg tub is cheaper per kilogram only if you use the paste before it skins over. The listing does not print a degree figure. It says high-temperature resistant for fireplaces, stoves, boilers, and chimneys, and the cure-time field says 24 hours. In the first 50 UK reviews the paste presses into log-burner and firebrick cracks and cures very hard, and repeat buyers say it matches earlier tubs. It is stiff, so a filling knife struggles until you press it by hand, buff or brown shows on a black stove pipe, cracked firebricks are described as a repair that needs doing again, and the remainder dries in the pot. Item weight is 600 g against a 500 g unit, and the container type says tube.
Pros
Cons
Best for: A small pale firebrick or fireback crack where you want the lowest cash outlay and can accept buff.
Less suitable: A black stove joint where the colour must match, or a repair that needs a printed degree figure.
Specifications
Common questions
Why is this the best value in this comparison?
It is the lowest shelf price among listings with at least 50 reviews and a usable weight: £5.27, with 4.5 from 480 reviews. That is a cash-price rule for a small repair, not a heat test. A 5 kg tub is cheaper per kilogram if you use it all.
Does the listing state a temperature?
No degree figure. It says high-temperature resistant for fireplaces, stoves, boilers, and chimneys. Colour is buff. Cure time on the listing is 24 hours.
What do the saved UK reviews repeat?
Praise is a hard set in cracks. Complaints are a stiff paste, a brown colour on black stoves, and cement drying in the pot.
Everbuild XL fire cement in the 5 kg pail is £19.03, rated 4.4 from 681 reviews on the saved amazon.co.uk listing. The title says buff and up to 1250°C, the water field says not water resistant, and a bullet says asbestos free. The colour attribute says clear or transparent, which conflicts with the buff title, so treat that attribute as unreliable until you see the tub. In the first 50 UK reviews, people wet the brick and use the ready-mixed paste on fireplaces and firebacks, and thin repairs then see later fires. It keeps if the lid stays sealed. The paste is a putty that sticks to dry tools, thick sections in a cold outdoor pit were described as taking weeks to dry, and pails arrive burst. A thick coat on ceramic fibre wool was a weak bond in those reviews. The score of 90 is stars plus review volume, not a heat ranking against the 1400°C Bostik bullet.
Pros
Cons
Best for: A larger buff indoor repair you will use before the tub dries, where 1250°C is the stated ceiling.
Less suitable: A wet outdoor joint, a thin crack that does not need 5 kg, or a colour-critical job that trusts the clear colour field.
Specifications
Common questions
What temperature and water claim are on the listing?
The title says up to 1250°C. The water field says not water resistant. A bullet says asbestos free.
Which colour should you trust?
The title and item type say buff. The colour attribute says clear or transparent, which conflicts. Treat the attribute as unreliable until you see the tub.
What do the saved UK reviews repeat?
Praise is easy ready-mixed use on fireplaces. Complaints are a stiff putty, slow drying in thick sections, and pails split in transit.
Everbuild XL fire cement 2 kg is £10.71 on the saved amazon.co.uk listing, model PCXLFIRE2, rated 4.4 from 232 reviews. The title says buff and 1250°C, and the water field says not water resistant. Across 24 UK reviews the paste is used on firebacks, side repairs, and mortar between crumbling fireplace bricks, including a skim. One long-term user says it keeps for years if the lid stays sealed. The repeated fault is a tub cracked or smashed in the post, with the paste dried. One outdoor chiminea use is praised, which sits against the not-water-resistant field. The volume field says 1,000 cubic centimetres against a 2 kg unit. The 5 kg Everbuild pail is £19.03 if you will actually use that much; this 2 kg tub is the smaller indoor job, and the score of 85 is stars plus review volume, not a lab test.
Pros
Cons
Best for: A mid-size buff indoor job at 1250°C where 2 kg is enough and 5 kg would sit unused.
Less suitable: A wet outdoor joint, or a buyer who needs every listing field to agree before they order.
Specifications
Common questions
How does this differ from the 5 kg Everbuild tub?
This listing is the 2 kg buff tub at £10.71, model PCXLFIRE2, with 4.4 from 232 reviews. The 5 kg listing is £19.03. Both titles say 1250°C and not water resistant.
What do the saved UK reviews repeat?
Praise is fireback and fireplace brick repairs. The repeated fault is a cracked tub in the post with dried paste.
Vitcas premium fire cement 2 kg is £10.99 on the saved amazon.co.uk listing, rated 4.4 from 87 reviews, and the colour is buff or grey. The water field says not water resistant and the cure-time field says 24 hours. No degree figure is printed. The container field says cartridge, while the title is 2 kg, the UK reviews describe a tub, and item weight is 2.32 kg against a 2 kg unit. In 12 reviews, buyers used it on a pizza-oven arch, a flue, and fireplace cracks, and one Victorian fireplace then had fires without new cracks. Two kilograms was called the right amount for an oven arch. The paste is thicker than expected, compared with play-doh or bubble gum, and a fireplace took a few days to cure. One buyer used it on an external barbecue and then found small print on the tub saying internal only.
Pros
Cons
Best for: A 2 kg buff or grey indoor patch, including a pizza-oven arch, if you accept the stiffness and keep it indoors.
Less suitable: A wet outdoor build, if you follow the not-water-resistant field and the internal-only note in that review.
Specifications
Common questions
Is this a cartridge?
The container field says cartridge. The title is 2 kg and the UK reviews describe a tub. Item weight is 2.32 kg against a 2 kg unit. The water field says not water resistant.
What do the saved UK reviews repeat?
Twelve reviews praise pizza-oven and fireplace repairs. Complaints are a play-doh consistency and a buyer who used it outside when the tub said internal only.
Somafix S160 black fire cement is a 310 ml cartridge at £12.99, rated 4.2 from 239 reviews on the saved amazon.co.uk listing. The listing claims 1500°C and waterproof. This comparison has no manufacturer sheet that confirms either line, so both stay listing claims. In the first 50 UK reviews it guns onto log-burner surrounds, an open-fire hood, and heat bricks, and it held firebrick pieces where a previous cement did not. Buyers also used it on a narrowboat wood burner and a biomass-boiler flue. One detailed review says a stove-pipe seal looked sound for weeks, then failed. Many other reviews are only a short line, so that failure is a single report, not a rate. At £12.99 it costs more than the Vitcas 310 ml at £5.99, which has 6,926 reviews, and the bullets also name fire doors and intumescent joints, which the burner-and-brick reviews do not describe.
Pros
Cons
Best for: A black cartridge job if you accept a higher cash price than the Vitcas 310 ml and an unverified 1500°C line.
Less suitable: A buyer who wants the same 310 ml format with the large Vitcas review count at £5.99.
Specifications
Common questions
Where do 1500°C and waterproof come from?
Both are on this amazon.co.uk listing. This comparison does not contain a manufacturer sheet that confirms them. The water field says waterproof.
What do the saved UK reviews repeat?
In 50 UK reviews, praise is gunning it onto burners and bricks. One detailed review says a stove-pipe seal failed after weeks. That is one report, not a rate.
Vitcas premium fire cement 5 kg grey is £16.99, rated 4.2 from 96 reviews on the saved amazon.co.uk listing. The water field says water resistant, the cure-time field says 4 hours, and no degree figure is printed. Specific uses on the field say Craft, while the bullets name firebricks, fireplaces, and ovens, so the use field and the bullets do not tell the same story. In 22 UK reviews it moulds, lasts through a heating season, and one buyer formed a firebrick shape for a fireplace back and smoothed it with printer paper. The lid and tub cracked in transit in one report, with about 60 percent of the paste still usable. Another tub arrived too dry and needed water kneaded in. One repair still cracked under very high heat. Check the pail on arrival, and buy 5 kg only if you will use it before the paste skins over.
Pros
Cons
Best for: A larger grey indoor repair if you will use 5 kg and check the tub on arrival.
Less suitable: A small crack, a black finish, or a buyer who needs a printed temperature.
Specifications
Common questions
What does the listing actually specify?
A 5 kg grey paste, water resistant on the field, cure time 4 hours, no degree figure. Specific uses on the field say Craft. Bullets name firebricks, fireplaces, and ovens.
What do the saved UK reviews repeat?
Praise is that it moulds and lasts in ordinary fireplace use. Complaints are a smashed tub with dried paste, cement that needed water kneaded in, and a crack that returned under intense heat.
Vitcas black fire cement 5 kg is £18.95 with 4.1 stars from 30 reviews, below the 50-review line used for badges in this comparison. The saved technical block has no temperature, water claim, or cure time. The package is listed as 20 × 20 × 14 cm, and the bullets name firebricks, stone, clayware, and metals. Eight UK texts praise fitting a stove, a hard surface, a narrowboat flue into a multi-fuel burner, and reducing a chimney opening for a log burner. One buyer had not used it yet. There is little negative detail in that small file, which is a limit of the sample, not proof the paste never fails. A small crack does not need 5 kg, and the 500 g black pot has 3,003 reviews at £5.99 if the job is a touch-up. The score of 71 is stars plus that thin review volume, not a fire test.
Pros
Cons
Best for: A large black tub only if you accept a 30-review sample and missing temperature and water fields.
Less suitable: A small crack, or a decision that depends on a stated degree figure.
Specifications
Common questions
Why is there no badge?
The listing shows 4.1 from 30 reviews. Badges in this comparison need at least 50 reviews. Temperature, water resistance, and cure time are not in the saved technical block.
What do the saved UK reviews say?
Eight UK texts praise stove fitting, a hard surface, a narrowboat flue, and reducing a chimney opening. One buyer had not used it yet. That is a small sample.
Twelve amazon.co.uk fire-cement listings, saved on 19 October 2026, were scored from the stored listing files and the UK review texts captured for each ASIN. This was not a lab heat test. The score is the star rating divided by five, times 70, then rounded, plus the base-10 log of the review count, times 10, and capped at 30. A 4.5 from thousands of reviews therefore sits above a 4.5 from a few hundred. A degree figure on the title is not added. Badges need at least 50 reviews and a usable weight. A review text copied from another listing does not earn a second badge. The top pick is the 310 ml cartridge that ties on 93 and has 6,926 reviews, against 3,003 on the 500 g black pot. The best value is the lowest shelf price among badge-eligible listings, about £5.27, not the highest score. A 5 kg tub is cheaper per kilogram only if you use the paste before it dries.
Star rating
70%The largest share of the score. Stars out of five are divided by five, multiplied by 70, and rounded. This is the amazon.co.uk average, not a heat test of the paste.
Review volume
30%The base-10 log of the amazon.co.uk review count, multiplied by 10 and capped at 30. A deep sample outranks the same star line on a thin sample. Listings under 50 reviews, an unusable weight, or a copied review block stay in the table and do not take a badge.
Start with the joint, then the place, then colour, then the pack you will finish, then the temperature printed as a ceiling for the paste. The notes below follow that order. None of these listings was heat-tested in a lab.
Fire cement is a ready-mixed paste for small rigid repairs and joints on indoor fireplaces, solid-fuel stoves, ranges, boilers and internal flues. UK buyers mostly fill a cracked firebrick or seal a stove collar. You judge a tub by the joint, a damp clean surface, a slow first heat, and whether you will finish the pack before it skins over. A higher temperature on the title is a ceiling for the paste, not a safer stove. A neat joint is not a building-regulations certificate.
Indoor paste is the default. Wet exteriors, immersion and a barbecue left in the rain are named limits on UK sheets. A review that praises an outdoor chiminea does not overturn a not-water-resistant field. If the tub says internal only, keep it indoors.
Black and buff are colour choices. Where both are rated, the figure is the same class, and black is not hotter. Reviews describe black paste fading towards grey or white after heat. Test a dab if the look matters.
A hairline crack wants paste in the gap, not a thick render. A door channel wants rope. The first flue joint by a stove often wants rope, then cement over it only where the appliance specifies that. Leaving the lid off wastes the tub, because opened paste goes hard.
The joint decides the paste before the pack size does. A hairline crack wants paste pressed into the gap. A fine collar or flue joint that you can reach with a sealant gun wants a cartridge. The first flue joint by a stove often wants thermal rope first, then cement over the rope only where the appliance specifies that. Other flue joints may want a heat-resistant silicone instead. A door channel wants rope, not a bead of cement in place of the rope. Laying firebricks wants a refractory mortar.
Colour is a match to the surface, not a temperature grade. Buff or grey is for pale brick and firebacks. Black is for a dark stove. Where a maker prints one figure for both colours, black is not hotter. UK reviews on black paste often describe a shift towards grey or white after heat, so test a dab if the look matters. A brown or buff smear on a black stove pipe is a common complaint on pale tubs. Pack size follows what you will finish before the paste skins over.
Three typical situations, each with a recommendation from this comparison.
You are sealing a narrow indoor joint you can reach with a sealant gun, and a colour shift after heat is acceptable. Vitcas black fire cement 310 ml is the top pick, at about £5.99 with 4.5 from 6,926 reviews. The title states 1250°C. The water field says it is not water resistant, and the container field says pail while the title says a cartridge.
You have a small crack in pale firebrick and you want the lowest cash outlay. Vitcas fire cement 500 g buff is the best value, at about £5.27 with 4.5 from 480 reviews. The listing does not print a degree figure. Buff shows on a black stove pipe, and leftover paste dries in the pot.
You will use about 2 kg of buff paste indoors and you want 1250°C printed on the title. Everbuild XL fire cement 2 kg is about £10.71 with 4.4 from 232 reviews. The water field says not water resistant. The repeated fault in the saved reviews is a tub cracked in the post.
The top pick is Vitcas black fire cement 310 ml at about £5.99. It ties on 93 with the 500 g black pot, and the cartridge has 6,926 reviews against 3,003. The title states 1250°C. The water field says it is not water resistant, and the container field says pail while the title says a cartridge. The best value is Vitcas fire cement 500 g buff at about £5.27, with 4.5 from 480 reviews. It is the lowest shelf price among badge-eligible listings, not the highest score. A 5 kg tub is cheaper per kilogram only if you use the paste before it dries.
Vitcas fire cement 500 g buff
Lowest shelf price among badge-eligible listings, at about £5.27, with 4.5 from 480 reviews.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public sources from the research digest. Shelf prices and star lines are the amazon.co.uk figures saved on 19 October 2026. The price band is this set, not a market average. No listing was heat-tested in a lab.
This page contains affiliate links to amazon.co.uk. If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are the stored amazon.co.uk figures, not a live crawl. We did not lab-test these pastes.
