The best roof coatings, compared.
Top pick: Bond It Bitumen Paint, Black, 5 L Best value: Nassboards Black Jack 905 All-Weather Roof Coating, 5 L – Five litres of named bitumen roof coating at about £28.99, with 4.6 from 346 reviews, when the job needs more than a 1-litre seal. Updated October 2026.
A roof coating is a liquid on a sound existing covering, usually felt, asphalt, metal or tile. On amazon.co.uk the usual job is a shed or garage, not a certified liquid-roof system. The style cell says silicone, and the manufacturer page does not call it 100% silicone. Chemistry, pack size and title-weight clashes are in the [roof coating buying guide](/hub/paints-and-varnishes/roof-coating/sub/roof-coating-buying-guide). It needs to be sound, attached and dry, and water needs a way to leave. A coating does not fix rot, a sag or a blocked outlet.
A roof coating is a liquid on a sound existing covering, usually felt, asphalt, metal or tile. On amazon.co.uk the usual job is a shed or garage, not a certified liquid-roof system.
36 products checked · 64 hrs invested · +22,100 readers
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Personal buying guide
Question 1 of 2
What are you coating?
Bond It’s 5-litre black bitumen paint is £24.99, with 4.8 from 22 reviews, and a rank of 11 in Roof Coatings & Paints. The bullets state 4–10 m² per litre, two coats, and use on metal, concrete, roofing felt, corrugated iron, and wood. Country of origin is the United Kingdom. The item-weight cell says 1 kg on a 5-litre tin. Captured reviews talk about posts, damp-proofing, smell, and cleanup more than about roofs. Treat it as a bitumen paint with a roofing line, not as a fibre roof compound.
Pros
Cons
Best for: Metal, wood, or felt where a general black bitumen paint and a stated 4–10 m² per litre rate are what you want
Less suitable: A thick fibre roof membrane, or a buyer who needs a large roof-only review sample
Specifications
Common questions
Can the listing be used on wood?
Yes. The bullets name wood, and also metal, concrete, roofing felt, and fibre cement.
Does it claim rust protection?
The bullets say it forms a barrier against rust on ferrous and non-ferrous metals, including steel, iron, aluminium, zinc, and lead.
How much area does the listing claim?
4–10 m² per litre, depending on porosity. Two coats are recommended.
This 5-litre black tin is sold as Nassboards Black Jack 905, a solvent-based bitumen roof coating, at £28.99, with 4.6 from 346 reviews. The bullets say it resists rain immediately after application, dries in 24 hours, and includes gloves and a 3-inch brush. Compatible materials include metal, concrete, slates, and tiles. Coverage is not on the captured page. Reviews mention shed and garage felt, and also mess. One buyer did not receive the brush and gloves. It is the best value in this set when you need litres of a named roof coating rather than a 1-litre seal.
Pros
Cons
Best for: A sound felt shed or garage where a 5-litre black bitumen roof coating is the job
Less suitable: Anyone who needs a printed square-metre rate, or a low-odour water-based seal
Specifications
Common questions
Does the listing say it is for metal roofs?
Compatible materials include alloy steel, concrete, metal, slates, and tiles. The surface cell says roof and wall.
What comes in the tin offer?
The bullets say a 5 L can, protective gloves, and a 3-inch brush. One captured review says the brush and gloves did not arrive.
Does the page print a coverage rate?
No. The captured listing does not state square metres per litre.
This is a 473 ml black liquid rubber at £19.30, with 4.5 from 2,378 reviews and a rank of 2 in Waterproofers. The surface cell says gutter. Compatible materials are PVC and rubber. The bullets do not state coverage, roof type, or a dry time. Reviews include a Velux skirt, flat-roof flashing, and a garage roof, and also slow drying, a small tin, and some clear-finish comments on a black listing. Use it for a seam or gutter, not as a 5-litre roof coating.
Pros
Cons
Best for: A gutter, flashing, or small crack where a 473 ml liquid rubber is enough
Less suitable: Recoating a shed or garage roof
Specifications
Common questions
Is this sold as a roof coating on the listing?
The surface-recommendation cell says gutter. The bullets do not name a roof type. Reviews on the page do describe roof flashings.
How much liquid is in the tin?
473 ml. Item weight is 560 g. No coverage rate is printed.
Does the listing say it dries quickly?
A product question asks that. The bullets do not answer it. Reviews both praise a 24-hour dry and complain that a thick coat dries slowly.
This is a 1-litre grey roof seal from Thompson's, made in the United Kingdom, at £17.79, with 4.5 from 440 amazon.co.uk reviews and a rank of 6 in Roof Coatings & Paints. The bullets say it flexes with the roof, resists UV fade, is rainproof in 6 hours, and outperforms standard bitumen paint. The style cell says Silicone. Coverage in square metres is not on the captured listing. Captured reviews describe shed felt leaks stopping after brushing. It is the top pick here for a small sound felt repair where a named UK roof seal and a large review count matter more than a 5-litre tin.
Pros
Cons
Best for: A sound felt, slate, tile, or metal patch where a 1-litre water-resistant roof seal is enough
Less suitable: A whole garage roof, or anyone who needs a printed coverage rate on the amazon.co.uk page
Specifications
Common questions
Does the listing say it can go on metal?
The compatible-material cell names tiles, slates, and metal. A product question also asks about metal roofs.
How soon does the listing say it is rainproof?
The bullets say the formula is rainproof in 6 hours. They do not print a coverage rate.
Is another colour listed on this page?
The colour cell is grey. The page asks whether other colours exist, and this capture does not list them.
The title is a white 4.7 kg liquid silicone for flat, pitched, bitumen, and metal roofs, at £65.98, with 4.4 from 46 reviews. The item-weight cell is 4.7 kg. The included-components line still says 1 kg of grey MS-COAT, and the unit count is 1,000 g. Bullets claim ponding resistance, −40°C to +120°C, no primer, and 1.5–2.0 kg/m² in two coats. Review text overlaps the grey ASIN. Buy the page only if a fresh check shows the white tub you expect.
Pros
Cons
Best for: A small flat area if you have confirmed the tub is the white 4.7 kg silicone on the title
Less suitable: Anyone who cannot check the pack, or a roof of many square metres at 1.5–2.0 kg/m²
Specifications
Common questions
Does the listing say it can go on metal?
Yes. The bullets name pitched corrugated metal, and also bitumen, felt, TPO, PVC, concrete, lead, and tiles.
Is this the 4.7 kg tub?
The title and the item-weight cell say 4.7 kg. The unit count is 1,000 g and the included-components line says 1 kg of grey MS-COAT.
Does the listing claim resistance to standing water?
The bullets claim permanent resistance to ponding water. They also state 1.5–2.0 kg/m² in two coats.
The title matches the white ASIN’s silicone claims, in grey, at the same £65.98, with 4.4 from 45 reviews. Here the item weight is 1 kg, the unit count is 1,000 g, and the included components say 1 kg of grey MS-COAT, against a 4.7 kg title. Model number is RC-Silicon-GREY. Bullets still claim ponding resistance and 1.5–2.0 kg/m² in two coats. At that rate, 1 kg covers under a square metre in two coats. Reviews praise thick brushing and also call it expensive.
Pros
Cons
Best for: A small grey silicone repair only after you confirm the kilograms in the tub
Less suitable: A whole flat roof bought on the 4.7 kg title alone
Specifications
Common questions
Which pack weight is on the page?
The title says 4.7 kg. The item weight is 1 kg, the unit count is 1,000 g, and the included components say 1 kg of grey MS-COAT.
Does the listing say it needs a primer?
The bullets say no torches, mixing, primers, or open flames, and that it is ready from the tub.
What coverage does the listing state?
1.5–2.0 kg/m² in two coats. At that rate a 1 kg fill covers less than 1 m².
This 1 kg clear coating is £21.99, with 4.2 from 197 reviews. The title names roofs, showers, and bathrooms. The bullets say water-based, about 15 square feet (1.4 m²) per kilogram, two or three coats, above 10°C, and a film after 48–72 hours. Two brushes are included. Reviews include bathrooms and bird baths, and also films that washed off or failed on a plastic shed. It is a small clear sealant that mentions roofs, not a roof membrane.
Pros
Cons
Best for: A tiny clear patch on a named hard surface, if you can keep it dry for the stated 48–72 hours
Less suitable: A felt garage roof or any area much above 1.4 m²
Specifications
Common questions
Does the listing say it can be used on bathroom tiles?
Yes. The bullets name ceramic tiles, marble, glass, and toilet leaks, as well as roofs.
How much area does 1 kg claim to cover?
About 15 square feet, which the listing equates to 1.4 m².
What temperature does the listing ask for?
Above 10°C, in clear and relatively dry weather. It says the waterproof layer forms after 48–72 hours.
This 300 g invisible sealant is £8.39, with 4.2 from 42 reviews. The title names roof and bathroom. The form is paste. Item weight is 380 g. There is no coverage figure. A contents bullet includes a brush. One review says a gutter crack was not fixed. Another says a later tub was blue and lumpy rather than clear. It is a small patch tin, not a roof coating for a shed.
Pros
Cons
Best for: A very small clear crack, if 300 g is all you need
Less suitable: Any whole roof, or a job that must stay invisible if the tub arrives coloured
Specifications
Common questions
Does it come with a brush?
The contents bullet says one 300 g bottle and one brush. The included-components line names only the adhesive agent.
Is a coverage rate printed?
No. The captured listing does not state square metres or grams per square metre.
Does the listing say it is for outdoor roofs?
The title names roof and bathroom. The bullets name cement, metal, tile, wood, and plastic, indoors and outdoors.
Tapel’s white 1-litre tin is titled as an RV roof coating, at £19.99, with 4.0 from 459 reviews and a rank of 10 in Waterproofers. The material cell says polyurethane. Bullets name ASTM G154 and EN 1504-2. Those lines are seller text and were not matched to a UK report in this file. Reviews split between small repairs and roofs that still leaked after several thin coats. Country of origin is China. The part-number cell is in German.
Pros
Cons
Best for: A small white patch on a caravan or similar surface if you accept a thin liquid
Less suitable: A roof that needs a thick bridging coat. Several reviews say leaks remained
Specifications
Common questions
Does the title say it is for a caravan roof?
The title says RV roof coating. A product question asks about caravan use. The bullets do not answer that question in a separate sentence.
What do the reviews say about thickness?
Several captured reviews call it thin, like gloss, and say a roof still leaked after more than one coat.
Are the ASTM and EN lines independently checked here?
No. They appear in the bullets. This comparison does not include a matching test report.
The title is a grey 5.7 kg MS-polymer coating for flat roofs, terraces, felt, concrete, and metal, at £68.99. Stars are 3.8 from 32, the lowest in this set. The weight cell and the included components say 1 kg. Bullets claim solvent-free, isocyanate-free, damp adhesion without primer, and −40°C to +80°C. The fibre sentence is marked as a fibre variant. Reviews mention thick or runny product, fast skinning in heat, and buyers who expected 5.7 litres.
Pros
Cons
Best for: A small damp felt or metal patch only if the tub in hand matches the weight you paid for
Less suitable: A large roof bought on the 5.7 kg title, or anyone who needs a stronger review score
Specifications
Common questions
Does the listing say it can go on a flat roof?
The title names flat roofs, terraces, balconies, felt, concrete, and metal.
Does it claim to work on a damp surface?
The bullets say it adheres without primer even when the surface is not bone dry, including bitumen, concrete, and weathered metal.
Is the fibre already in this tin?
The bullet says integrated fibres apply to fibre-reinforced MS-COAT FIBER variants. This title says Standard.
We compared ten amazon.co.uk roof coating listings kept for this set. Shelf prices, stars and review counts are the UK lines captured on 16 October 2026. Each score is an editorial figure from 0 to 100 using the weights below. It is not the star rating multiplied by 20, and it is not a laboratory result. No score awards a service life, a BBA certificate or a system warranty. A higher score is a rank inside this set for a stated job.
Chemistry and surface
30%Up to 30 points for a named roof seal, bitumen roof coating, bitumen paint, liquid rubber, silicone or clear sealant, and whether that chemistry matches felt, metal, a gutter or a tiny patch.
Pack and coverage
25%Up to 25 points when the pack can cover the job at the maker's rate. A 473 ml or 300 g tin cannot recoat a garage. A missing rate is marked, not invented.
Listing integrity
20%Up to 20 points for a weight cell that matches the title, and deductions when 4.7 kg or 5.7 kg in the title sits beside a 1 kg cell, or when a lab line is not backed here.
Review evidence
15%Up to 15 points from the star rating and the review count, and from whether the written comments match a roof rather than a bathroom, a post or a failed leak.
Price
10%Up to 10 points from the shelf price in GBP. A lower price per litre is price, not a durability claim.
A roof coating on these ten amazon.co.uk listings is a liquid for a sound existing covering, usually a shed or garage. Read the chemistry, the pack against the area, and whether the weight cell matches the title. A star rating is not a BBA certificate, and none of these scores is a laboratory test.
A roof coating is a liquid you put on a sound existing covering, usually felt, asphalt, metal or tile. It is not a new roof and it is not a certified liquid system. UK buyers on amazon.co.uk are mostly sealing a shed or garage. None of the ten listings kept here was matched to a BBA certificate, so a star rating is not a system warranty. Start with the deck. It needs to be sound, attached and dry, and water needs a way to leave. A coating does not fix rot, a sag or a blocked outlet.
The grey COATERA silicone title says 4.7 kg and the weight cell says 1 kg. The white page pairs a 4.7 kg weight cell with a 1 kg grey component line. MS-COAT's title says 5.7 kg and the weight cell says 1 kg. At the stated 1.5–2.0 kg/m² in two coats, a 1 kg fill covers less than 1 m².
Bond It's 4–10 m² per litre is a bitumen paint rate. It is not the rate for a fibre roof compound. Sika's about 1.25 m² per litre per coat is context for the Black Jack 905 name, not a test of the Nassboards tin. Dirt, a full blister, rot or a blocked outlet are not jobs for any of these tins.
Thompson's publishes a limit of not below 10°C, with a second coat after 6 hours. A clear 1 kg or 300 g sealant will not waterproof a garage roof. Solvent bitumen is flammable. HSE guidance is not to sand or rub down asbestos cement before painting.
Match the chemistry to the surface before you match the price. Felt and asphalt want a named roof seal or a fibre bitumen roof coating. Thompson's 10 Year Roof Seal is the water-based elastomeric in this set. The manufacturer page says about 2 m² per litre, a second coat after 6 hours, and not below 10°C. The amazon.co.uk style cell says silicone. The manufacturer page does not call it 100% silicone. Nassboards Black Jack 905 is sold as a solvent bitumen roof coating.
Buy the pack that matches the area, using the maker's rate, and only when the listing's weight matches the title. Thompson's publishes about 2 m² per litre, so 1 litre is a patch or a small roof, not two coats on a garage. Bond It publishes about 4–10 m² per litre. The COATERA silicone titles state 1.5–2.0 kg/m² in two coats. At that rate a true 4.7 kg tub covers only a few square metres. If the page is actually 1 kg, it covers less than 1 m².
Three typical situations, each with a recommendation from this comparison.
You have a sound felt, slate, tile or metal patch and a 1-litre tin is enough. Thompson's 10 Year Roof Seal is about £17.79, with 4.5 from 440 reviews. The bullets say rainproof in 6 hours. Coverage in square metres is not on the captured listing, and the 10 Year name is not a test result.
The felt is sound and you want litres of a named black roof coating. Nassboards Black Jack 905 is 5 litres at about £28.99, with 4.6 from 346 reviews. The bullets say rain-resistant immediately and dry in 24 hours. Reviews mention mess, and one buyer did not receive the brush and gloves.
You are sealing a seam, a gutter or a small crack, not recoating a roof. Gorilla Waterproof Coat & Seal is 473 ml at about £19.30. The surface cell says gutter. The 4.5 from 2,378 reviews does not show that this tin will coat a whole roof.
The top pick is Thompson's 10 Year Roof Seal, grey, 1 litre, at about £17.79. It has the highest editorial score in this set, 90, from a named UK roof seal, rainproof in 6 hours on the bullets, and 4.5 from 440 reviews. The 10 Year name is the product name, not a laboratory result, and the captured listing does not print a square-metre rate. The best value is Nassboards Black Jack 905, 5 litres at about £28.99, score 86, with 4.6 from 346 reviews, when you need litres of a solvent bitumen roof coating. Coverage is not printed on that listing either, and reviews mention mess.
Nassboards Black Jack 905 All-Weather Roof Coating, 5 L
Five litres of named bitumen roof coating at about £28.99, with 4.6 from 346 reviews, when the job needs more than a 1-litre seal.
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 UK sources used for the coverage, drainage and safety points on this page. Prices, stars and review counts are from the amazon.co.uk listings on 16 October 2026.
This page contains affiliate links to amazon.co.uk with the tag pcuk26-21. If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are the UK listing lines from 16 October 2026. We did not run a lab test.
