The best sealants, compared.
Top pick: Sika SikaSeal sanitary silicone, white – Highest star band, and the largest review count on a sanitary cartridge: about £7.69, 4.5 from 10,620 reviews, with a mould-resistant title. Best value: Sika SikaSeal general purpose silicone – Same star band at the lowest full-cartridge price: about £5.00, 4.5 from 7,959 reviews. Check the date before you cut the nozzle. Updated 22 October 2026.
A sealant closes a joint against water or draught. In a UK bathroom or kitchen that is usually silicone paste in a cartridge or a squeeze tube, or a self-adhesive strip that covers the joint rather than filling it. Shoppers are mostly sealing a bath, shower, basin, sink or a short gap. The useful difference is the joint, not the word waterproof. A wet room needs a flexible sanitary silicone with a fungicide. A straight, shallow edge that does not move can take a strip. A joint you must paint needs a different product, because standard silicone is not paintable. Chemistry, pack and joint size are set out in the [sealant buying guide](/hub/fillers-adhesives-and-sprays/sealant/sub/sealant-buying-guide). A vinegar smell means an acetoxy cure, which suits glass and glazed ceramic and is the wrong default for marble, granite and some bare metals. Neutral or stone-rated silicone is a separate product. Movement class, a clean dry gap and in-date stock matter more than a waterproof line. A mould claim is not a promise the bead stays white, and it does not replace an extractor fan.
A sealant closes a joint against water or draught. In a UK bathroom or kitchen that is usually silicone paste in a cartridge or a squeeze tube, or a self-adhesive strip that covers the joint rather than filling it.
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Personal buying guide
Question 1 of 2
What is the joint?
Sika SikaSeal sanitary silicone is a white cartridge at about £7.69, listed at 4.5 from 10,620 reviews on amazon.co.uk. Reviewers describe a creamy bead that tools around a bath and a bright white that can be wiped clean. The title calls it mould resistant, and the item type is an Everbuild 500 bath and sanitary silicone, model EVB500WH, so the Sika brand line and the Everbuild name sit on the same listing. A sealant gun is not in the box. The title says 295 ml and a bullet says 310 ml, so the fill is not one figure. Once the cartridge is open, reviews note a missing cap, which matters if you meant to keep the rest for a second joint. Outdoor use is only an unanswered question on the listing. It is the top pick here for a bath or shower you can leave to cure, not for a façade the listing does not confirm.
Pros
Cons
Best for: A bath, shower or basin joint when you already have a gun and can leave the bead to cure.
Less suitable: A one-tap patch, a peel-and-stick cover, outdoor work this listing does not confirm, or a stone worktop.
Specifications
Common questions
Is this a mould-resistant bathroom silicone?
The listing title says mould resistant, and the highlight says anti-fungal. The item type is an Everbuild 500 bath and sanitary cartridge. The listing does not quote a cure time.
Do you need a sealant gun?
It is a cartridge. A review notes the gun was the buyer’s own. A gun is not in the included components.
How much is in the cartridge?
The title says 295 ml and a bullet says 310 ml. Both figures are on the listing, so the pack size is not a single number.
The white Sika general-purpose cartridge is about £5.00, listed at 4.5 from 7,959 reviews. Reviewers mostly say it does the job on sheds, uPVC and general DIY. The bullets add an anti-fungal claim and name EN 15651 for façade, cold climate and sanitary use. The highlight on this listing is worktops, laminates and household use, and exterior use is not stated there. The title says 260 ml while the volume field says 280 ml. The repeated complaint is the date: one reviewer reported an expired cartridge and another a manufacturing date about 26 months old, past Everbuild’s 24-month shelf-life example for this family. It is the best value full cartridge in this set if you check the date before you cut the nozzle.
Pros
Cons
Best for: A household or uPVC job when you want a full cartridge at the lowest price among the 4.5-star silicones and you will check the manufacture date.
Less suitable: A shower you want sold as sanitary first, or any cartridge whose date is past the 24-month example.
Specifications
Common questions
Does the listing claim a mould inhibitor?
Yes. The bullets say anti-fungal ingredients for bathrooms and kitchens. The product name is general purpose, not sanitary.
Which standard is named?
The bullets say EN 15651 for façade, cold climate, and sanitary applications. No certificate is attached to the listing.
Is the cartridge sold as exterior sealant?
The highlight on this white listing is worktops, laminates, and household use. Exterior use is not stated. A listing question asks about outdoors and is not answered.
Everbuild’s clear general-purpose silicone is about £6.00, listed at 4.5 from 7,669 reviews. The highlight says interior and exterior, and the listing cites EN 15651, with polyvinyl chloride named as a compatible material. Reviews mention sheds, a gate and bathroom touch-ups. One outdoor review reported shrinkage and weaker adhesion unless the bead was applied heavily. Messy application appears once in the sample. The title says 260 ml and the unit count says 280 ml. Clear is a colour, not a higher waterproof grade than the white cartridge at about £5.00 in this set. Choose it when the joint should disappear against glass or a pale tile, and still lay a heavy enough outdoor bead if the gap is moving.
Pros
Cons
Best for: A clear bead on PVCu, a shed or a bathroom touch-up where a white line would show.
Less suitable: A wide outdoor joint you will not fill heavily, or a white sanitary line around a bath.
Specifications
Common questions
Can this clear cartridge be used outdoors?
The listing highlight says it is suitable for interior and exterior use. One review reported shrinkage outdoors after a couple of months.
Is a standard named?
Yes. Supported standards on the listing say EN 15651, and the bullets mention façade, cold climate, and sanitary applications.
What colour is this variant?
Clear. The same listing text says the range also includes black, brown, grey, and white, but those are not this ASIN.
The 151 white silicone is a 70 g squeeze tube at about £3.35, listed at 4.3 from 3,448 reviews, with 70 ml in the volume field. The listing states a 24-hour full cure, a waterproof claim and ceramic as a compatible material. Reviewers like the narrow nozzle for taps and door frames, and they like not opening a full cartridge for a short repair. They also say it is hard to squeeze, easy to under-extrude, and that it dries in the nozzle if you come back later. Several treat it as a holding repair rather than a whole shower reseal. There is no mould-resistant field on the listing. It earns its place as the small-job tube, not as the bath seal.
Pros
Cons
Best for: One tap, a short frame gap, or a holding repair when you do not want to open a cartridge.
Less suitable: Resealing a whole bath or shower, or a joint that needs a stated fungicide.
Specifications
Common questions
Do you need a sealant gun?
No. It is a squeeze tube. Reviews say it takes a firm squeeze and that the nozzle can be cut narrow.
Is a mould-resistant claim on the listing?
No. Waterproof is stated. Mould resistance is not a field or a bullet on the listing.
How long does the listing say it takes to cure?
Full cure time on the listing is 24 hours. That is the only cure figure on the listing.
ADVANCEDSIL’s clear kitchen and bathroom silicone is a 120 ml squeeze tube at about £8.99, listed at 4.3 from 914 reviews, with a finishing tool in the pack. Reviewers praise the smoother, the cap and the size for patches. The listing claims waterproof and mould resistant, and it names glass, ceramic, tiles, metal, plastic, porcelain, stainless steel and wood. Complaints are a strong smell in a small room, the tube setting hard so it cannot be reused, and the modest volume next to a cartridge. A bullet says 120 g while the pack is sold as 120 ml, and the part number contains WHT while the colour field says clear. Heat resistance is an unanswered listing question. You pay more per millilitre than the cartridge at about £5.00 for the tool and the smaller tube.
Pros
Cons
Best for: A clear kitchen or bathroom patch when you want a smoother in the box and you will use the tube in one session.
Less suitable: A full bath run, a heat-rated joint the listing does not confirm, or a tube you need to reopen the next day.
Specifications
Common questions
Does a smoother come in the box?
Yes. Included components list a finishing tool, and reviews mention using it to neaten the bead.
Is heat resistance stated?
No. “Is it heat resistant?” appears as a listing question and is not answered on the listing.
What surfaces does the listing name?
Compatible materials are glass, ceramic, tiles, metal, plastic, porcelain, stainless steel, and wood. The title limits the pitch to kitchen and bathroom.
The SOL strip is a white 7 m peel-and-stick roll at about £5.99, listed at 4.3 from 81 reviews. The listing says waterproof and names baths, showers, sinks and worktops, but mould resistance is not a filled spec. One reviewer measured the width at about 22 mm and described a centre groove. The spec table does not state a width, so that 22 mm figure is a review measurement, not a manufacturer cell. Another reviewer said the ends lifted within a day and corners could not be done in one piece, so water sat under the tape. Reviewers suggest a hair dryer to soften the strip, which is an application tip, not a cure. It covers a straight edge without a gun. It does not fill a moving shower corner.
Pros
Cons
Best for: A straight, shallow bath or worktop edge you can press onto a clean, dry surface.
Less suitable: Shower corners, a wide gap, or a joint that moves when the bath is filled.
Specifications
Common questions
Is this silicone in a tube?
No. It is a 7 m self-adhesive sealant strip. The listing says peel, stick, and press, with no gun.
Does the listing say it is mould resistant?
Mould resistance is asked as a question and is not a filled spec. Waterproof is the stated resistance.
Where does the listing say to use it?
Recommended uses are bathroom, general sealing, kitchen, and window. The highlight names baths, showers, sinks, and worktops.
AILUYA’s pack is two white 6 m rolls, 8 mm wide, at about £6.99, listed at 4.3 from only three reviews. The bullets set the maximum gap fill at 8 mm, the same figure as the width, and one of those reviews said the tape was too thin to bridge the gap. The material field says PVC and a bullet says acrylic, so the chemistry is not settled on the page. The title says mildewproof. That is a title word, not a sanitary test. Twelve metres sounds generous until the strip is only 8 mm across. Three reviews are not a pattern you can lean on. Buy it only for a hairline cover you have measured, not as a bath seal.
Pros
Cons
Best for: A measured hairline on tile or a window where 8 mm of cover is enough and you accept a tiny review sample.
Less suitable: Any gap wider than 8 mm, a shower corner, or a job where you need a settled star rating.
Specifications
Common questions
How wide is the tape, and what gap does the listing allow?
The bullets say each roll is 8 mm wide. Maximum gap fill is also 8 mm. A review said it was too thin to bridge their gap.
Is the material PVC or acrylic?
The material field says PVC and a bullet says acrylic. The listing does not resolve that.
How many reviews are on the listing?
Three, at 4.3 out of 5. That is too small a sample to treat the star rating as a settled pattern.
MAGOSIS seal tape is a white PVC strip, 3.8 cm by 3.2 m, at about £5.99, listed at 3.8 from 87 reviews, the lowest stars in this set. A smoother is included, the bullets claim anti-mould, and there is a crease for a 90-degree corner. Some reviewers say it stuck on a worktop seam or a wet-wall panel. Others say the adhesive does not hold and that peeling the strip pulls the glue off the tape. The listing also mentions gas stoves, RVs and trailers. Those are seller claims, not a reason to cover a gas appliance. One review described two rolls, while the spec says one. At 3.2 m it is shorter than the 7 m SOL roll, though it is the widest strip here.
Pros
Cons
Best for: A short, wide cover on a flat worktop or panel edge if you press it firmly and accept the mixed adhesion reviews.
Less suitable: A shower corner you cannot afford to have lift, or anything near a gas appliance or flue.
Specifications
Common questions
How wide and how long is the roll?
The title and spec say 3.8 cm wide and 3.2 m long, one roll. A review described about 4 cm by 300 cm and two rolls, which does not match the spec.
Is a smoother included?
Yes. Included components list a sealant smoother, and the bullets say to press the tape and smooth it.
Does the listing claim it resists mould?
The bullets say anti-mould. No standard is named. Shower-tray use is only a listing question, not an answered spec.
Eight amazon.co.uk sealant listings were scored from the stored star band. This is a shelf snapshot, not a laboratory test. A 4.5 maps to 90, a 4.3 maps to 86, and a 3.8 maps to 76. Review count does not pull a three-review 4.3 off that band, so that 86 is not a reliability sample. Listing conflicts, lifted strips and old stock stay in the written assessment. They do not create a second score. The top pick is the highest band, with a tie broken by the largest review count on the sanitary cartridge. Best value is the same band at the lowest full-cartridge price, with a date-check limit. The lowest tube price is not best value for a full bath. A waterproof field is not scored as a shower-corner seal. A mould or anti-fungal line is a listing claim, not a promise the bead stays white. The order on this page follows those stored listings.
Amazon star band
100%The stored score is the amazon.co.uk star band only: 4.5 maps to 90, 4.3 maps to 86, and 3.8 maps to 76. Review count does not move a listing off its band. A 4.3 from three reviews stays on 86 and is not a reliability sample. Listing conflicts, lifted strips and old stock are written beside the score. They are not a deduction and they do not create a second score.
Match the joint, the cure and the pack before the brand. A waterproof line is not a shower-corner seal, and a mould claim is not a promise the bead stays white.
A sealant closes a joint against water or draught. In UK shops that is silicone paste in a cartridge or a squeeze tube, or a self-adhesive strip that covers the joint. A bath, shower or basin needs a flexible sanitary silicone with a fungicide. A straight, shallow edge that does not move can take a strip. A joint you must paint needs a different product, because standard silicone is not paintable.
Smearing silicone over a mouldy bead leaves the joint dirty. Cut the old bead out, clean the gap, and dry it. A fungicide on the new cartridge does not clean the old one, and it does not replace an extractor fan.
Showering before the bead has cured lets water under the joint. A peel-and-stick strip across a gap wider than the tape, or around a tight corner in one piece, lifts. Water then sits underneath.
A clear tube is a colour, not a stone-safe cure. Acetoxy silicone can leave a permanent stain on porous stone such as marble or granite. Neutral or stone-rated silicone is not in this set.
A shower, bath or basin needs a flexible sanitary silicone. A straight, shallow, non-moving edge can take a strip. A joint you must paint needs another product, because standard silicone is not paintable. A vinegar smell means acetoxy, which suits glass and glazed ceramic and is the wrong default for marble, granite and some bare metals. Soudal UK describes that smell and permanent edge staining on porous stone.
A cartridge needs a gun and covers about 10 metres of a 6 mm bead on the Everbuild yield figure. A 70 g tube suits one tap and is harder to squeeze. A strip avoids the gun and fails when the gap is wide or the corner is tight. Everbuild quotes 24 months from manufacture. An expired cartridge can extrude and still fail to cure, so check the date before you cut the nozzle. An anti-mould additive does not replace an extractor fan.
Three typical situations, each with a recommendation from this comparison.
You want a sanitary cartridge and a dry day before the joint is used again. Sika SikaSeal sanitary silicone is the top pick: a white cartridge at about £7.69, 4.5 from 10,620 reviews, with a mould-resistant title. A gun is not in the box. The title says 295 ml and a bullet says 310 ml. Thin tape is the wrong cover for a leaking corner.
You want a short repair without opening a full cartridge. The 151 white tube is about £3.35, 4.3 from 3,448 reviews, and it needs no gun. Reviewers use the narrow nozzle on taps and frames. It is hard to squeeze, and the listing has no mould-resistant claim. Do not open a landlord's shower tray.
You want general-purpose silicone for uPVC and gaps, and you will check the date. The white general-purpose cartridge is the best value at about £5.00, 4.5 from 7,959 reviews, with EN 15651 named on the listing. Reviews report expired or old stock. It is not sold as sanitary first, and the highlight does not state exterior use.
The top pick is Sika SikaSeal sanitary silicone at about £7.69: a white cartridge, 4.5 from 10,620 amazon.co.uk reviews, and a mould-resistant sanitary title. The item type is an Everbuild 500 bath and sanitary silicone. A gun is not included, the title says 295 ml and a bullet says 310 ml, and reviews note a missing cap once it is open. The best value is the white general-purpose cartridge at about £5.00, also 4.5, from 7,959 reviews, with an anti-fungal claim and EN 15651 named on the listing. Check the manufacture date: reviews report expired or old stock. The same star band on the clear cartridge is not the lowest full-cartridge price. The about £3.35 tube is not best value for a full bath. This order follows the stored listings. It is not a laboratory test.
Sika SikaSeal sanitary silicone, white
Highest star band, and the largest review count on a sanitary cartridge: about £7.69, 4.5 from 10,620 reviews, with a mould-resistant title.
Sika SikaSeal general purpose silicone
Same star band at the lowest full-cartridge price: about £5.00, 4.5 from 7,959 reviews. Check the date before you cut the nozzle.
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 are the stored listing snapshot in the digest, not a live scrape. The digest does not give a separate retrieval date.
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 stored listings. This is not a laboratory test.
