Best bathroom silicone sealant
Updated: 23 October 2026
Several silicones in this amazon.co.uk set sit at 4.5 stars, so the star does not say whether you are resealing a shower, patching a tap, or covering a straight edge. Best, on this page, means the listing that matches a wet sanitary joint. We used the stored listings and review notes, not a lab. A qualifying purchase can earn a commission at no extra cost to you. Prices are the GBP snapshot on our [sealant comparison](/hub/fillers-adhesives-and-sprays/sealant).
Several silicones in this amazon.co.uk set sit at 4.5 stars, so the star does not say whether you are resealing a shower, patching a tap, or covering a straight edge.
Several silicones in this amazon.co.uk set sit at 4.5 stars, so the star does not say whether you are resealing a shower, patching a tap, or covering a straight edge. Best, on this page, means the listing that matches a wet sanitary joint. We used the stored listings and review notes, not a lab. A qualifying purchase can earn a commission at no extra cost to you. Prices are the GBP snapshot on our sealant comparison.
Our top picks
| Badge | Product | Suited to | Pack | Mould claim | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Sika Sika SikaSeal sanitary silicone, white | Bath or shower | 295 or 310 ml | Mould resistant | 9.0 | about £7.69 | View offer |
| Best value |  Sika Sika SikaSeal general purpose silicone, white | Household, if in date | 260 or 280 ml | Anti-fungal | 9.0 | about £5.00 | View offer |
 151 151 silicon sealant, white tube | One tap or a short frame | 70 g | Not stated | 8.6 | about £3.35 | View offer |
On this page
What best means here
Best here means a bath, shower or basin joint that stays flexible after the old bead is cut out. A 4.5 from thousands of reviews is not a fungicide trial, and we did not grow mould. The top pick for the wet joint is the white sanitary cartridge if you can use a gun. The best value full cartridge is the cheaper general-purpose white, after a date check. The £3.35 tube is only for a short repair. A strip is not the bathroom winner. If the bead is already black because the room stays wet, read mould-resistant bathroom sealant before a new cartridge is the whole fix.
Sanitary cartridge for a bath or shower
Sika SikaSeal sanitary silicone is about £7.69, at 4.5 from 10,620 reviews. The title says mould resistant, and the item type is Everbuild 500, so the Sika brand field and the Everbuild name are one listing. Reviewers describe a creamy bead around a bath and a bright white that can be cleaned. A gun is not included. The title says 295 ml and a bullet says 310 ml. Reviews note a missing cap once it is open. Outdoor use is an unanswered question. Skip it for a stone worktop.
Lower price and smaller packs
The white Sika general-purpose cartridge is about £5.00, at 4.5 from 7,959 reviews: the same star band, a lower price, anti-fungal bullets, and EN 15651 named. The highlight is worktops, laminates and household use. Exterior use is not stated. The repeated complaint is the date. One review reported an expired cartridge, another a manufacturing date about 26 months old, past Everbuild’s 24-month example. Check the stamp before you cut the nozzle. The 151 white tube is about £3.35 for 70 g, at 4.3 from 3,448 reviews, with a stated 24-hour cure and no mould claim. Reviewers like the narrow nozzle for taps and say it dries in the nozzle. It is a holding repair, not a whole shower.
Clear silicone and what to skip
Everbuild clear general-purpose silicone is about £6.00, at 4.5 from 7,669 reviews, with an interior-and-exterior highlight and EN 15651 named. One outdoor review reported shrinkage unless the bead was heavy. Clear is the right colour when a white line would show. It is not a higher waterproof grade than the £5.00 white cartridge. ADVANCEDSIL is about £8.99 for 120 ml, at 4.3 from 914 reviews, with a finishing tool, a strong smell in a small room, and a tube that sets hard. Skip strips for a shower corner: MAGOSIS is 3.8 from 87 reviews, and AILUYA’s 8 mm rolls have three reviews. Stone worktops are outside this set.
Common questions
Which listing is the one for a bath or shower?
The white sanitary cartridge at about £7.69, sold as Sika SikaSeal and item-typed as Everbuild 500. It has the mould-resistant title, the largest review file, and bath-and-sanitary wording. You still need your own gun, and you should not treat 295 ml and 310 ml as the same fill.
Is the cheaper general-purpose cartridge good enough?
It can be, for household and uPVC work, at about £5.00 and 4.5 from 7,959 reviews, with an anti-fungal claim. It is not labelled as the sanitary product, and reviews include old stock. For a full shower, the sanitary cartridge is the closer match if you can use a gun.
When is the £3.35 tube the better buy?
When the job is one tap, a short frame, or a holding repair, and you do not want to open a cartridge. The 151 tube has no mould claim and reviewers find it hard to squeeze. It is the wrong economy if you are about to run a whole bath edge.
Why is the 120 ml clear tube the dearest?
ADVANCEDSIL is about £8.99 for 120 ml because the pack includes a finishing tool and a smaller squeeze tube, not because the listing shows a better cure or a larger review file. The £5.00 cartridge is more paste for less money if you already own a gun. Pay the premium only for a one-session clear patch.
Do more stars mean less mould?
No. The 4.5 scores are amazon.co.uk ratings, not a mould chamber. A fungicide on the label resists growth on the bead. It does not dry a steamy room. A strip with a mildew word in the title is not more resistant than a sanitary cartridge because the title says so.
Which product should I skip for a whole shower?
Skip the 70 g tube, the 8 mm tape, and any strip you hope will turn a corner in one piece. The 151 tube is a holding repair in reviews. SOL reviewers reported ends lifting and corners that had to be pieced. A whole shower wants a sanitary cartridge in a clean, dry joint.
Is there a best clear silicone here for a sink?
For a glazed ceramic or stainless sink, the clear Everbuild cartridge at about £6.00 is the fuller pack, with an interior-and-exterior highlight. ADVANCEDSIL is the no-gun alternative if the patch is small and you want the smoother. Neither is a stone silicone.
Related pages
Sources
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.
- Sika Everbuild general-purpose silicone (retrieved 22 October 2026)
- UniBond sanitary silicone sheet (retrieved 22 October 2026)
- UniBond Triple Protection sheet (retrieved 22 October 2026)
- Soudal UK acetoxy and neutral-cure FAQ (retrieved 22 October 2026)
- Soudal UK silicone on natural stone (retrieved 22 October 2026)
- Soudal sealing strip technical data sheet (retrieved 22 October 2026)
- GOV.UK damp and mould (retrieved 22 October 2026)
- GOV.UK construction products (retrieved 22 October 2026)
- BSI EN 15651 series (retrieved 22 October 2026)