The best acrylic sealants, compared.
Top pick: Soudal decorator caulk, white, pack of 2 Best value: Soudal decorator caulk – Highest star rating among the white two-packs after the top pick: about £6.18, 4.6 from 1,051 reviews, and a stated 10 mm gap. Updated 22.10.2026.
Acrylic sealant in a UK decorating shop is a water-based cartridge, also called decorator's caulk or frame sealant, for static gaps you will usually paint. It dries as water leaves the bead, so a deep fill shrinks, and it does not recover like silicone. Baths, showers and opening sashes stay with other products. Class, interior or exterior marking, paint time and colour are set out in the [acrylic sealant buying guide](/hub/fillers-adhesives-and-sprays/acrylic-sealant/sub/acrylic-sealant-buying-guide). The scores use the listings and the manufacturer limits named below. A moving sash needs a brush or compression seal, not a bead that glues it shut. The static frame-to-wall gap, and only that gap, is the case in [acrylic sealant for window frames](/hub/fillers-adhesives-and-sprays/acrylic-sealant/sub/acrylic-sealant-window-frames). Read the chemistry on the cartridge, not only the marketplace title. Silicone, hybrid polymer, liquid rubber and craft varnish appear in the same search and are different products. On the UK data sheets used for this page, quality is a stated movement class, an interior or exterior mark, a realistic paint time, and a colour you can hide or match.
Acrylic sealant in a UK decorating shop is a water-based cartridge, also called decorator's caulk or frame sealant, for static gaps you will usually paint.
18 products checked · 54 hrs invested · +18,600 readers
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Personal buying guide
Question 1 of 2
Where is the gap?
The Soudal decorator pack is two white 290 ml cartridges at about £6.18, listed at 4.6 from 1,051 reviews. Reviewers fill cracks at skirtings and door frames and describe a smooth flow that paints over. The listing caps the gap at 10 mm and says the bead can be papered as well as painted. The Amazon cure cell says 20 minutes, which lines up with a skin, not a full cure. A few reviewers had to go back over a crack that opened, and one order arrived with the nozzle snapped on both tubes. The title says acrylic silicone while the material field says acrylic. Older copy was read as 310 ml; these cartridges are 290 ml.
Pros
Cons
Best for: You want a white decorator caulk with a stated 10 mm gap and the highest star line in this set, and you will paint or paper the joint.
Less suitable: A joint that moves, a wet room, or any job where the silicone word in the title would send you to the wrong paste.
Specifications
Common questions
Is Soudal decorator caulk silicone?
The title says acrylic silicone, but the material field says acrylic. Treat it as acrylic decorator caulk unless the cartridge label says otherwise. Soudal's sheet for Decorators Caulk states 10 percent movement and no continuous immersion.
What gap will it fill?
The listing states a maximum gap fill of 10 mm. It is described for gaps and cracks, with adhesion to many porous surfaces. The professional sheet allows up to 20 mm with depth control and a backer rod.
Can you paint or wallpaper over it?
Yes. The bullets say it is paintable and can be papered over. Soudal says paint after curing, and the paint must be elastic enough or the film can crack.
Sika Caulk Once is two white 295 ml cartridges at about £5.38, and the amazon.co.uk line is 4.5 from 11,926 reviews. Reviewers gun it into skirtings, stairs and ceiling lines, tool a neat bead, and a few sand it before paint. The listing gives a 15-minute tack and says you can overpaint in about an hour, depending on the room. The same reviews call the paste too thick for a narrow blind gap, and screw heads and wood indents still sink after three fills. One discounted pack arrived short-dated, so one tube was wasted. The Amazon full-cure cell of 15 minutes matches that tack line, while the Sika page puts full cure at 3 to 5 days. The included-components line says one cartridge and the title is a pack of two.
Pros
Cons
Best for: You are filling skirtings, cornices and static frame gaps you will paint, and you want the cartridge with the largest review file in this set.
Less suitable: A shower or a bath rim, or a hairline gap where a thick paste will not tool in.
Specifications
Common questions
Can you paint Sika Caulk Once?
The listing says it can be overpainted in 1 hour, depending on site conditions. It also lists a 15-minute tack time. The Sika page puts full cure at 3 to 5 days, so the 15-minute cell is a skin, not a finished cure.
Is this pack for outside?
The product bullets describe skirtings, cornices, frames, stairs and plaster. They do not state outdoor use, so that is not shown on the listing. The Sika page marks an EN 15651 façade class. Read the cartridge you bought.
How many cartridges are in the pack?
The title and the item count say two 295 ml cartridges. The included-components line says one cartridge, which does not match the pack title.
Everflex 175 is one white 300 ml cartridge at about £6.20, listed at 4.4 from 1,621 reviews. The bullets say internal and external, mould-resistant and overpaintable, and reviewers have used it on uPVC, brick, a metal shed and a gutter. It guns and smooths with a wet finger, and one cartridge covered a small frame or shed job for several buyers. It stays soft for a long time on some jobs, and a minority report cracking or a bead that went hard after weeks. It washed off in a shower and failed as a bath-edge seal. Some deliveries arrived without a nozzle, and sealant leaked at the thread. The listing says 25 items, while the title and the included line describe one cartridge.
Pros
Cons
Best for: A static exterior frame, masonry or shed joint you will paint, where a lower movement figure is enough.
Less suitable: A shower, a bath rim, or any joint in constant water. The waterproof field is not a wet-room rating.
Specifications
Common questions
Can Everflex 175 be used outside?
Yes. The listing says it is suitable for internal and external use, including timber and metal frames, stone and concrete. The data sheet states plus or minus 7.5 percent movement and excludes continuous immersion.
Is it mould-resistant?
Yes. The bullets say it remains permanently flexible, is mould-resistant and can be overpainted. That claim is not a shower rating. Reviewers report it washed off a shower and a bath edge.
Is this a single cartridge?
The title, the 300 ml unit count and the included-components line describe one cartridge. A separate field says 25 items, which does not match.
The 151 brown frame sealant is one 280 ml cartridge at about £3.76, listed at 4.3 from 859 reviews. The title limits it to internal uPVC, wood and metal frames, and the water-resistance field says it is not water resistant. Reviewers use the brown to blend with wooden frames, wood-effect flooring and a wooden shed, and they cut the nozzle to different widths. The bullets claim up to 13.5 metres and say it will not shrink or crack, which is a listing claim rather than a measured result. Several cartridges arrived with no nozzle, and some tubes were damaged in delivery. One review used it on bitumen roof sheets, which sits outside the interior-frame use on the title.
Pros
Cons
Best for: An indoor brown or wood-effect frame gap you may leave visible or paint later.
Less suitable: Anything outside, a wet joint, or a white skirting you want to hide under emulsion.
Specifications
Common questions
Can this brown sealant go outside?
No. The title says it is suitable for internal use only, and the water-resistance field says it is not water resistant. Do not treat a shed or roof review as an exterior rating.
Will it match a wood-effect frame?
It is brown, and the bullets describe it for darker frames, wooden trims and painted skirting. It can be painted when dry. It is the colour match in this set, not the white decorating packs.
Does a nozzle come with it?
The bullets say an application nozzle is included. Some reviewers received a cartridge with no nozzle. Check the tube before you need it.
This white cartridge is about £4.18, with 310 ml in the title, and the amazon.co.uk line is 4.2 from 13 reviews. Only two of those reviews were captured, and both are short praise: easy to apply, and it did what was needed. The bullets say flexible, quick drying, paintable, and a fit for a standard gun, with no dry time, gap width or indoor-or-outdoor line. The water-resistance field says not water resistant. The brand prints as WELLA and the manufacturer as Procter & Gamble, which do not match a sealant maker, so those fields are left as printed. A nozzle is not in the included-components line.
Pros
Cons
Best for: A low-cost white interior bead, if you can read the cartridge label before you rely on the listing.
Less suitable: An exterior joint, a wet room, or any choice that needs a review file larger than 13.
Specifications
Common questions
Is this cartridge waterproof?
No. The listing water-resistance level is not water resistant. The bullets say it is flexible, quick drying and paintable. There is no gap width and no indoor or outdoor line.
Which brand made it?
The listing prints the brand as WELLA and the manufacturer as Procter & Gamble. Those fields are stored as printed and have not been checked as the sealant maker. The model number is 10023A.
Will it fit a normal sealant gun?
Yes. The bullets say it fits all standard cartridge guns. A nozzle is not in the included-components line, so check the tube before you load a gun.
Five amazon.co.uk acrylic sealant listings were scored on a 0–100 scale. Amazon evidence is 30 points, from the star rating, with a hard deduction when the count is under 50. Listing fit is 35 points, from a stated gap, a clear interior or exterior line, and a pack that matches the title. A silicone word in an acrylic title, a brand field that does not match a sealant maker, and a 25-item count on a single cartridge are deducted. Review outcome is 20 points: named decorating or frame jobs score above a shower wash-off, missing nozzles, or a file of two short lines. Value is 15 points, from the shelf price in GBP for a pack a review can still describe. The lowest price does not win when the cartridge is internal-only brown or the review file is 13 lines. The highest score is the top pick. The highest star rating among the white two-packs, after the top pick, is the best value. A waterproof field is not scored as a shower seal. A 15- or 20-minute Amazon cure cell is treated as a skin time when the sheet says days. Prices are the amazon.co.uk shelf prices on 19 October 2026. This is not a laboratory test.
Amazon evidence
30%Star rating on amazon.co.uk, then a hard deduction when the count is under 50. A 4.2 from 13 reviews does not outrank a large UK review file.
Listing fit
35%A stated gap, a clear interior or exterior line, and a pack that matches the title score higher. A silicone word in an acrylic title, a brand field that does not match a sealant maker, and a 25-item count on one cartridge are deducted.
Review outcome
20%Named decorating or frame jobs score higher than a shower wash-off, missing nozzles, or a file of two short lines.
Value
15%Shelf price in GBP for a pack a review can still describe. The lowest price does not win when the cartridge is internal-only brown or the review file is 13 lines.
Read the cartridge, not only the marketplace title. Match movement class, interior or exterior marking, paint time and colour to a static joint you will usually paint. A waterproof field is not a shower seal, and a 15-minute cure cell is a skin time when the sheet says days.
Acrylic sealant in UK decorating shops is a water-based acrylic cartridge. The same family is sold as decorator's caulk or as frame sealant. It fills static gaps you will usually paint: skirtings, architraves, plaster cracks and the still joint between a frame and the wall. It dries as water leaves the bead, so a deep fill shrinks, and it does not stretch back the way silicone does. Baths, showers and opening sashes are other products.
A bullet that says waterproof or water resistant does not make a bath or shower seal. Sheets for Caulk Once, Decorators Caulk and Everflex 175 exclude continuous immersion. Everflex washed off a shower in reviews.
A 15- or 20-minute Amazon cure cell is a skin time. The Sika page puts full cure at 3 to 5 days. Screw heads and wood indents still sink after deep fills. Tool a shallow bead and wait for a skin before paint.
Do not put an internal-only cartridge outside in the rain, and do not glue a moving sash. Opening windows need brush or compression seals. Bitumen, floor joints and below-ground work are outside this set.
ISO 11600 F 12.5P or EN 15651-1 class 12.5P means about 12.5 percent movement and plastic behaviour. F-INT is interior. F-EXT-INT is interior and exterior. Sika's page for Caulk Once states F 12.5P. The Amazon bullets do not state outdoor use, so that two-pack is scored on the decorating jobs reviewers name, not as an exterior rating. Soudal Decorators Caulk states 10 percent and is sold for interior joints, with a 10 mm cap on the DIY instructions and on the Amazon pack.
Manufacturer sheets for Caulk Once, Decorators Caulk and Everflex 175 exclude continuous immersion. Score a waterproof or water-resistant Amazon field as a listing word, not as a shower seal. Everflex reviewers report a wash-off on a shower and a failed bath edge. Caulk Once can be overpainted in about 1 hour after a skin, depending on the room. Soudal says the bead is paintable and paperable, and that you paint after curing with a film elastic enough not to crack.
Three typical situations, each with a recommendation from this comparison.
You want a white interior caulk for skirtings, cornices and static frame gaps, and a large amazon.co.uk review file. Sika Caulk Once is the top pick: two 295 ml cartridges at about £5.38, 4.5 from 11,926 reviews, overpaintable in about an hour on the listing. It is too thick for a narrow blind gap.
You want a stated gap and a bead you can paint or paper. The Soudal decorator two-pack is the best value at about £6.18, 4.6 from 1,051 reviews, with a 10 mm cap on the listing. The title says acrylic silicone and the material field says acrylic. It is an interior joint, not a wet room.
The joint is outside, still, and you will paint it. Everflex 175 is the listing that states internal and external use, plus a mould-resistant claim, at about £6.20, 4.4 from 1,621 reviews. Movement on the sheet is plus or minus 7.5 percent. It washed off a shower in reviews.
The top pick is Sika Caulk Once at about £5.38: two white 295 ml cartridges, 4.5 from 11,926 amazon.co.uk reviews, and a listing that says you can overpaint in about an hour. Reviewers gun it into skirtings, stairs and ceiling lines. It is too thick for a narrow blind gap, and screw heads can still sink. The best value is the Soudal decorator two-pack at about £6.18, 4.6 from 1,051 reviews, with a stated 10 mm gap that you can paint or paper. The title says acrylic silicone and the material field says acrylic. Neither cartridge is a bath or shower seal. A 15- or 20-minute Amazon cure cell is a skin time, not the 3-to-5-day full cure on the Sika page.
Soudal decorator caulk
Highest star rating among the white two-packs after the top pick: about £6.18, 4.6 from 1,051 reviews, and a stated 10 mm gap.
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 19 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.
