The best white silicone sealants, compared.
Top pick: Dowsil 785+ silicone, white and clear, 2 pack Best value: Sika general purpose silicone – Best value in the awards: about £5.00, 4.5 from 7,959 reviews, anti-fungal ingredients and an EN 15651 line with no class digit. Updated 22 October 2026.
Silicone white is a pigmented, moisture-curing sealant sold in the UK for a bead that should look white against a bath, a basin, tile or a uPVC frame. You buy it to reseal a bathroom, patch a short gap, or point a window. The colour does not tell you the cure chemistry or the mould class. Quality is the match of the joint, the substrate and a declared class. A wet room wants a sanitary fungicide. A moving frame wants a low-modulus neutral cure and a movement figure. EN 15651-3 covers sanitary joints. EN 15651-1 covers facade joints. A line that only says EN 15651, with no class digit, is incomplete. Class, substrate and pack size are set out in the [white silicone buying guide](/hub/fillers-adhesives-and-sprays/silicone-white/sub/silicone-white-buying-guide). Acetoxy silicone smells of vinegar. It suits glass and glazed ceramic, and it can mark natural stone or corrode copper, brass and lead. A squeeze tube is a small repair. A cartridge needs a gun. Paint does not stick to silicone, so a joint you will paint is a different product.
Silicone white is a pigmented, moisture-curing sealant sold in the UK for a bead that should look white against a bath, a basin, tile or a uPVC frame.
44 products checked · 67 hrs invested · +26,800 readers
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Personal buying guide
Question 1 of 2
Where is the joint?
The Dowsil 785+ pack, about £18.99, is two 310 ml acetoxy cartridges, one white and one clear, with a mould-resistant title and a sanitary-grade line that does not give an EN number. The star line is 4.7 from 24 reviews, and only seven written reviews were read. Those lines call it easy to use, and one non-professional sealed a shower and stopped a leak. Mould resistance is described as staying mould-free for years around splashbacks and baths, which is a reviewer comment rather than a tested life. The weight and dimension fields read like one cartridge, not two. A 4.7 from a thin file does not outrank the sanitary cartridge with 10,620 reviews. Buy the pair when you will actually use both colours.
Pros
Cons
Best for: A bathroom or kitchen where you will use both a white bead and a clear bead from the same 785 silicone.
Less suitable: A single white bath, a buyer who wants a deep review file, or a listing whose weight should match a two-cartridge pack.
Specifications
Common questions
What is in the pack?
The listing says two 310 ml cartridges, one white and one clear. The weight and dimensions read like one cartridge.
Is it mould resistant?
Yes on the title and the bullets. The standards field says sanitary grade and does not give an EN number.
Does it come with an applicator?
The listing asks and does not answer. The included line names the two silicones, not a separate tool.
UniBond Triple Protection white, about £13.49 for 291 g, is the anti-mould cartridge reviewers buy when bath silicone has already shown fungus, and 4,120 amazon.co.uk reviews sit at 4.6. The listing says it repels, kills and prevents mould, that it is touch dry in 20 minutes and fully dry in 24 hours, and that one cartridge covers one bath, two showers and two sinks. Reviewers describe a smooth ultra-white finish. A heavy user calls the adhesion weaker than other silicones they use at work, and the price is called high next to other sealant. The dimension line of 50 × 50 × 2,300 mm is not a plausible cartridge length. No EN class is printed. It is a well-reviewed anti-mould bath cartridge at the top of the single-cartridge prices in this set, and it is not the best value.
Pros
Cons
Best for: A white kitchen or bathroom joint, including a power shower, when you want the stated 20-minute and 24-hour lines.
Less suitable: A buyer chasing the lowest price, a window movement class, or anyone treating the listing’s kills-mould line as a lifetime promise.
Specifications
Common questions
Is it mould resistant?
Yes on the listing. The bullets say it repels, kills and prevents mould. No EN class is printed. Treat that line as the listing claim, not a lifetime promise.
When does the listing say it is dry?
Touch dry in 20 minutes and fully dry in 24 hours. Coverage is given as one bath, two showers and two sinks. A sheet cure of a few millimetres a day can still apply to a deep bead.
Can it be used on windows?
The listing asks and does not answer. Window use is not stated. Shower is the surface recommendation.
The Dowsil 785 white cartridge, about £12.00 for 310 ml, is an acetoxy sealant the listing calls bacteria resistant, with a mould and mildew line and a 24-hour full cure. Across 171 amazon.co.uk reviews the star line is 4.6. Reviewers use it on an acrylic shower basin with PVC walls after a cheaper sealant failed, and one calls the odour lower than another brand they had used. One reviewer says it stays white longer in a comparison they made themselves. If a profiling tool is rushed, the bead ripples. The brand field says AIGHER and the manufacturer field says Dow, and the listing prints no EN 15651 number and no movement class. The water-resistance field says water resistant while a bullet says waterproof. It is a named sanitary acetoxy cartridge with a real review file, and the class digit is not on the page.
Pros
Cons
Best for: A bathroom or kitchen joint where you want a named Dowsil 785 acetoxy cartridge and a 24-hour cure line.
Less suitable: Natural stone, a printed movement class, or a buyer who needs the storefront brand and the manufacturer to be the same name.
Specifications
Common questions
What cure does the listing name?
Acetoxy. It also says a 24-hour full cure. No movement class is printed.
Does it resist mould?
The bullets say it resists mould and mildew. The title says bacteria resistant. No EN class is printed.
Is it waterproof?
The water-resistance field says water resistant. A bullet says waterproof.
The Soudal Trade six-pack, about £21.28, states a fungicide, initial hardening in 7 minutes and a full cure in 24 hours, with a maximum gap fill of 30 mm. The star line is 4.6 from 32 reviews, and the seven written reviews are mostly one line. Long-term users call the make reliable, and the silicone has been used on a shower and a bath. One review mentions a strong smell after the job and still recommends the brand. Volume is not stated, so a price per cartridge is not a price per millilitre, and the window question is unanswered. No EN class is printed. Do not read an S1 mould class onto this multi-purpose pack. That declaration belongs to a different Soudal sanitary product. It suits a house or a van that will open six brilliant-white cartridges, and it is a poor match for a single bath.
Pros
Cons
Best for: Several rooms, or a trade kit, where six fungicidal white cartridges will be used.
Less suitable: One bath, a printed movement class, or a buyer who needs the millilitres on the page.
Specifications
Common questions
What cure times are on the listing?
Initial hardening in 7 minutes and a full cure in 24 hours. Maximum gap fill is stated as 30 mm.
Does it state a fungicide?
Yes. It also says the colour is permanent and the seal is UV resistant. No EN class is printed.
Can it be used on windows?
The listing asks and does not answer. Window use is not stated.
The Shopstop pack, about £8.99, pairs a white silicone the title calls 70 g with a finishing tool, and 24 amazon.co.uk reviews sit at 4.6. Reviewers say the tools help a beginner get a neater line on hand basins, showers and baths, and that the remover edge is useful on old sealant. The unit count says 150 g, the included line says 70 g, and the listed weight is 140 g, so the fill is not settled on the page. There is no mould claim and no cure time. The tube is small, the work is still messy, and the kit does not make an unskilled bead neat by itself. One review was a gaming-wall panel rather than a bathroom. It is a short repair with a tool in the box, and it is not a classed sanitary cartridge.
Pros
Cons
Best for: A beginner doing one small basin or sink edge who wants a smoothing tool in the same order.
Less suitable: A full bath, a stated fungicide, or anyone who needs the fill size to match across the listing.
Specifications
Common questions
Does this need a cartridge gun?
No. The included line is a 70 g silicone and a finishing tool, not a gun cartridge.
Is it mould resistant?
The listing asks and does not answer. Mould resistance is not stated.
How much silicone is in the pack?
The title and the included line say 70 g. The unit count says 150 g. The listed weight is 140 g.
Across 10,620 amazon.co.uk reviews the Sika sanitary cartridge, formerly Everbuild 500, is the white bath and kitchen bead people describe as creamy and bright, and the star line is 4.5 at about £7.69. Reviewers who are not professionals use it around a bath and a kitchen sink, smooth it with a finger, and say the cured line can be scrubbed when cleaning. The title says mould resistant and the highlight says anti-fungal and quick curing, with no minute figure and no EN class on the listing. The title says 295 ml and a bullet says 310 ml. There is no cap, so an opened cartridge cannot be closed, and a smell is mentioned without a repeated complaint that it is too strong in the lines read. It is the top pick in this set for a white sanitary joint because the review file is the deepest and the listing names a mould-resistant bath silicone. That is the listing order, not a laboratory ranking.
Pros
Cons
Best for: A white bath, shower or basin joint where you want the largest review file on a mould-resistant cartridge.
Less suitable: A frame that needs a printed movement class, or a job you will return to with the same opened cartridge.
Specifications
Common questions
Is it mould resistant?
Yes on the listing. The title says mould resistant and the highlight says anti-fungal. No EN class is printed.
Which fill size is on the listing?
The title says 295 ml. A bullet says 310 ml.
Can it be used outdoors?
The listing asks and does not answer. Outdoor use is not stated. The surface line includes shower and window.
Across 7,959 amazon.co.uk reviews the Sika general purpose white cartridge, about £5.00, is used around sinks, showers, a shed gap, a patio door and internal window frames, and the star line is 4.5. Reviewers call the nozzle easy to cut and say the bead sticks and stops water coming through. The listing states anti-fungal ingredients and EN 15651 for facade, cold climate and sanitary use, without a class digit. The title says 260 ml and the volume field says 280 ml. One reviewer received a cartridge with a manufacturing date of 20 May 2024 and returned it as too old to use. Many of the 50 reviews read are only a short line, so faults are thinly described. It is the best value cartridge in this set when you want one tube with a large review file, and it is not a classed sanitary specialist.
Pros
Cons
Best for: One general-purpose cartridge for kitchens, bathrooms and small exterior gaps, if you check the date code.
Less suitable: A joint that needs a printed movement class, or a buyer who treats EN 15651 as a full sanitary code.
Specifications
Common questions
Does this need a cartridge gun?
Yes. The listing says to apply it with a caulk or sealant gun.
Is it described as mould resistant?
The bullet says anti-fungal ingredients for bathrooms and kitchens. No EN 15651 class digit is printed.
Can it be used outdoors?
The listing asks and does not answer. Outdoor use is not stated.
The Soudal Trade white three-pack, about £12.30, states a fungicide, UV resistance and a flexible seal on glass, metals, wood and ceramic tile. The star line is 4.4 from 33 reviews, and only four written reviews were in the file. Those lines call the paste creamy, easy to finish with a rubber blade, and bright white once set. On a hot day it skins quickly, so you cannot pause mid-bead. Volume and cure time are not stated, and the window question on the listing is unanswered. If all three cartridges arrive, the pack is about £4.10 each, and that figure is not a price per millilitre because the fill is missing. Do not read an S1 mould class onto it. That declaration belongs to a different Soudal sanitary product.
Pros
Cons
Best for: You will use three brilliant-white cartridges on glass, tile, wood or metal and you do not need a printed class.
Less suitable: A single bath, a window with a movement figure, or a buyer who wants a stated fill size.
Specifications
Common questions
Is it waterproof?
Yes. The listing says waterproof and a weathertight seal.
Does it state a fungicide?
Yes. The bullet says it contains a fungicide to resist mould. No EN class is printed.
Can it be used on windows?
The listing asks and does not answer. Window use is not stated. Glass, metals and wood are named.
The 151 white tube, listed at about £3.35, is a 70 g squeeze pack reviewers use on taps, a basin waste, a door frame or a short bath edge, and 3,448 amazon.co.uk reviews sit at 4.3. They cut the nozzle to about 1.5 mm and they do not use a cartridge gun. Some could still squeeze paste weeks or months later. The listing states waterproof and a 24-hour full cure, and it states no fungicide and no EN 15651 class. The metal tube is hard to squeeze, it crumples, and it can burst if you force it after the paste has started to dry. A vinegar smell is described as present but not overpowering, and a complete novice finds the bead hard to control. The model number contains 4x while the listing is a single tube, so this is a small repair rather than a four-pack or a stated sanitary cartridge.
Pros
Cons
Best for: A short repair where you want a squeeze tube and can accept a 70 g fill.
Less suitable: A full bath or shower reseal, or a joint that needs a stated mould class.
Specifications
Common questions
Does this need a cartridge gun?
No. It is a 70 g tube, and the reviews say it is used without a gun.
Does it dry clear?
The listing asks and does not answer. The colour field is white, and reviews describe a bright white.
Is a mould claim stated?
No. Mould resistance is not stated. The listing says waterproof and a 24-hour full cure.
The Siroflex LMN cartridge, about £6.99 for 300 ml, is the only listing in this set that states 12.5 percent joint movement and names windows, glazing and indoor and outdoor use. The star line is 4.3 from 18 reviews. One reviewer says it adhered to a uPVC frame, and another used it around decking tiles in hot weather. The listing also says EN 15651 and frost resistance down to −15°C, and it does not answer whether the silicone is mould resistant. Two of the reviews read call the bead almost liquid and hard to place on door frames, and one cartridge arrived with no nozzle. Several reviews describe anthracite grey or rosewood, which does not match the white title. Treat the movement figure as the reason to look at it, and treat the review file as too thin, and too mixed on colour, to confirm the cartridge from the text alone.
Pros
Cons
Best for: A white frame or glazing joint where you need a printed 12.5 percent movement figure and you can check the cartridge colour on arrival.
Less suitable: A bath reseal that needs a mould answer, or anyone treating the review text as proof this unit is white.
Specifications
Common questions
Is it mould resistant?
The listing asks and does not answer. Mould resistance is not stated. The Bostik sheet for this LMN silicone states a sanitary XS1 class. Read the cartridge you receive.
What movement does the listing state?
12.5 percent joint movement, plus an EN 15651 line with no class digit.
Does it work on metal?
The listing asks and does not answer. Metal use is not stated.
The Enócilis box, about £31.95, is twelve tubes with nozzles, titled as anti-mould white silicone for kitchens and bathrooms, and 19 amazon.co.uk reviews sit at 4.0. Short reviews call it good value, and one says it is workable. The paste is described as very thick, so the smoothed edge is not clean, and the cured colour is called semi-transparent white rather than solid white. The colour field says yellow and white, which already conflicts with the title. One review says paint will not cover it and leaves white lines, and another says it is a poor match for worktops and windows. The unit count says 300 ml against a box of twelve, and the listed weight is 330 g. It is a bulk pack whose reviews do not treat the cure as a bright white match.
Pros
Cons
Best for: A buyer who wants many small anti-mould tubes and will accept a semi-transparent white.
Less suitable: A bright white bath match, a paintable joint, or a worktop and window job.
Specifications
Common questions
Can it be painted over?
The listing asks and does not answer. One review says it is not paintable. Paintability is not a listing claim. Paint does not stick to silicone in general.
Is the colour white?
The title says white. The colour field says yellow and white. Reviews describe a semi-transparent white.
Does it resist mould?
The title and a bullet say mould and mildew resistant. No standard is printed.
The Mr Prime 151 multipurpose tube is listed at about £6.99 for 70 g, with a precision nozzle, and the page names bathrooms, kitchens, showers and sinks. There is no amazon.co.uk star line and no review text in the listing file, so there is nothing to check against a finished joint. The listing says a cartridge gun is unnecessary. It does not state a cure time, a fungicide or a movement class. The same 70 g size already exists in this set as the 151 tube at about £3.35 with 3,448 reviews. Damp-surface use is asked on the listing and left unanswered. You are paying more for a tube this comparison cannot score from reviews.
Pros
Cons
Best for: Only if you specifically want this nozzle listing and you accept a page with no reviews.
Less suitable: Anyone who wants review evidence, a stated cure, or the cheaper 151 tube that already has a large file.
Specifications
Common questions
Does this need a cartridge gun?
No. The listing says a large cartridge and gun are unnecessary for this 70 g tube.
How long does it take to cure?
The listing asks and does not answer. Cure time is not stated.
Can it be applied to damp surfaces?
The listing asks and does not answer. Damp-surface use is not stated.
Twelve amazon.co.uk white silicone listings were scored on a 0–100 scale. Amazon stars and review count are 45 points. A 4.5 from several thousand reviews sits above a 4.7 from a few dozen. A listing with no star line sits at the bottom of this set. Whether the listing states the duty is 25 points. A fungicide line, an EN 15651 reference, a movement figure or a cure time counts. A blank standard does not. EN 15651 without a class digit is only a partial statement. Price against this set is 20 points. A single cartridge around £5 to £8 scores higher here than a £19 to £32 multipack, unless the pack states a cure time the singles leave blank. The method file also deducts, up to 15 points, for a title that disagrees with the volume field, a colour field or review text that is not white, a review count under 30, and a storefront brand that disagrees with the manufacturer field. Those four blocks are weighted 45, 25, 20 and 10 here so the weights sum to 100. The weight of 10 is the gap that brings the three positive blocks to 100. The method still applies deductions of up to 15, and those points only reduce a score. They are not a 10-point award. The highest score is the top pick. Best value is the general-purpose cartridge in the awards. UniBond also scores 92 and does not take a second award. Prices, stars and review counts are the figures in the listing files scored on 21 October 2026. This order is the listing order. It is not a laboratory test.
Amazon stars and review count
45%Star rating and review count on amazon.co.uk. A 4.5 from several thousand reviews sits above a 4.7 from a few dozen. A listing with no star line sits at the bottom of this set.
Stated duty
25%A fungicide line, an EN 15651 reference, a movement figure or a cure time counts. A blank standard does not. EN 15651 without a class digit is only a partial statement.
Price against this set
20%A single cartridge around £5 to £8 scores higher here than a £19 to £32 multipack, unless the pack states a cure time the singles leave blank.
Deductions
10%A title that disagrees with the volume field, a colour field or review text that is not white, a review count under 30, and a storefront brand that disagrees with the manufacturer field. The method file allows deductions of up to 15 points. The weight of 10 is the gap between the 90-point positive ceiling and 100. Those points only reduce a score. They are not a 10-point award.
Match the joint, the substrate and a declared class before you look at the price. White is the colour. It does not name the cure or the mould class. A 24-hour line on a listing is a skin or a shallow bead, not a cure depth for every joint.
Silicone white is a pigmented, moisture-curing paste for a bead that should look white against a bath, a basin, tile or a uPVC frame. People buy it to reseal a bathroom, patch a short gap, or point a window. The colour does not tell you the cure chemistry or the mould class. Quality is the match of the joint, the substrate and a declared class. Name the joint first. A shower or bath edge wants sanitary silicone with a fungicide. A uPVC perimeter wants a frame sealant and a movement figure.
The new bead needs a clean, dry joint. Old silicone, a damp rim, and a shower taken because the skin has formed are the failures named for this category. Fill a bath before you seal the rim and leave the water in until the bead has cured.
Acetoxy suits glazed ceramic, glass and enamel. It can mark natural stone and can corrode copper, brass and lead. The Dow 785 sheet excludes marble, granite, concrete and mirror silver. A white title does not change that.
Soudal multi-purpose packs state a fungicide and do not state an EN class. Soudal Trade Sanitary S1 is a different declaration. EN 15651 with no class digit is a partial statement, not a sanitary code.
Name the joint, then the cure. A wet room wants a fungicide and, where the cartridge prints it, EN 15651-3. S1 or XS1 is the higher mould band. S3 and XS3 are weaker. A moving frame wants a movement figure: 12.5 percent, 20 percent and 25 percent are different joints. EN 15651-1 covers facade joints. Acetoxy is the usual read on glazed ceramic, glass and enamel. Neutral cure is the safer read on many plastics, sensitive metals and natural stone.
A 70 g tube is a short repair and often cures in the nozzle. A cartridge needs a gun. A multipack is cheaper per tube only if you finish the cartridges before they skin. Check the title against the volume field: 295 ml against 310 ml, 260 ml against 280 ml, and 70 g against 150 g are conflicts in this set. A colour field that says yellow and white, or reviews that name grey or rosewood, means you check the cartridge on arrival. A 24-hour full-cure line is the listing claim for a shallow bead.
Three typical situations, each with a recommendation from this comparison.
You are resealing one bath, shower or basin and you want a mould-resistant cartridge with the largest review file in this set. Sika sanitary, formerly Everbuild 500, is the top pick at about £7.69, 4.5 from 10,620 reviews. The title says 295 ml and a bullet says 310 ml. There is no class digit and no cap once it is open.
You want one cartridge for kitchens, bathrooms and a small exterior gap, and you will check the date code. Sika general purpose is the best value at about £5.00, 4.5 from 7,959 reviews, with an anti-fungal bullet and an EN 15651 line that has no class digit. The title says 260 ml and the volume field says 280 ml.
You are sealing a white frame or glazing joint and you want a printed movement figure. Siroflex LMN states 12.5 percent movement and EN 15651, at about £6.99, 4.3 from 18 reviews. Mould resistance is unanswered, and some reviews describe other colours. Check the cartridge colour on arrival.
The top pick is the Sika sanitary cartridge, formerly Everbuild 500, at about £7.69. It scores 94. On amazon.co.uk it is 4.5 from 10,620 reviews, with a mould-resistant title and an anti-fungal highlight. The title says 295 ml and a bullet says 310 ml, and there is no class digit. The best value is the Sika general purpose cartridge at about £5.00, score 92, 4.5 from 7,959 reviews, with an anti-fungal line and EN 15651 stated without a class. The two-point gap is the award split. UniBond Triple Protection also scores 92, with touch dry in 20 minutes and fully dry in 24 hours, and it does not take a second award because about £13.49 is not the value pick. A 4.7 from 24 reviews does not outrank a 4.5 from 10,620. This order is the listing order. It is not a laboratory test.
Sika general purpose silicone
Best value in the awards: about £5.00, 4.5 from 7,959 reviews, anti-fungal ingredients and an EN 15651 line with no class digit.
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 this comparison. amazon.co.uk prices, stars and review counts were taken from the listings on 21 October 2026.
Expert source (DIY & tools): Charlie White (Charlie DIYte) (external profile) – public expert commentary used as a research source, not as a contributor to our pages.
This page contains affiliate links to amazon.co.uk (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 from the listings. This is not a laboratory test.
