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Bathroom sealant buying guide

Updated: 23 October 2026

You already know the joint: a bath edge, a sink, a uPVC trim, or a straight gap you would rather cover than fill. Waterproof on the pack does not choose a sanitary silicone, a general-purpose cartridge, a squeeze tube, or a peel-and-stick strip. This bathroom sealant buying guide is the type decision for the eight listings in our [sealant comparison](/hub/fillers-adhesives-and-sprays/sealant). We matched those listings to public UK maker notes and did not run a lab test. A qualifying purchase can earn us a commission at no extra cost to you. Prices are the GBP snapshot in that comparison.

You already know the joint: a bath edge, a sink, a uPVC trim, or a straight gap you would rather cover than fill.

Our top picks

Sika Sika SikaSeal sanitary silicone, white

Best overall

Sika Sika SikaSeal sanitary silicone, white
9.0/10about £7.69
View offer
Sika Sika SikaSeal general purpose silicone, white

Best value

Sika Sika SikaSeal general purpose silicone, white
9.0/10about £5.00
View offer
151 151 silicon sealant, white tube

Rank 3

151 151 silicon sealant, white tube
8.6/10about £3.35
View offer
On this page
  1. 1.What you are sealing
  2. 2.Sanitary silicone, general-purpose silicone, or a strip
  3. 3.Acetoxy, neutral cure, and EN 15651
  4. 4.Pack size, date, and the listings

What you are sealing

A wet bath, shower or basin edge has to stay flexible and keep water out of the wall. A straight, shallow worktop line can take a strip if it is clean, dry and rigid. A gap you will paint needs another product, because these silicones are not decorator’s caulk. Ordinary acetoxy silicone can leave a permanent dark edge on marble or granite. If the ceiling below is stained, or the tray has dropped, stop buying.

Sanitary silicone, general-purpose silicone, or a strip

The sanitary cartridge here is white Sika SikaSeal, item type Everbuild 500, at about £7.69, with a mould-resistant title. The gun is not in the box. The white general-purpose Sika at about £5.00 and the clear Everbuild at about £6.00 both claim an anti-fungal and name EN 15651, and they are still called general purpose. SOL, MAGOSIS and AILUYA cover the line. They fail on a wide gap, a tight corner or a lifted end. None of the eight is a neutral-cure silicone or a paintable caulk. The 151 tube is 70 g at about £3.35 for one tap, with no mould field. ADVANCEDSIL is 120 ml at about £8.99, with a finishing tool.
Sika Sika SikaSeal sanitary silicone, white

Testsieger

Sika Sika SikaSeal sanitary silicone, white
9.0/10about £7.69
View offer

Acetoxy, neutral cure, and EN 15651

A vinegar smell is an acetoxy cure. Soudal’s UK notes call the dark edge on porous stone permanent. UniBond’s acetoxy sanitary sheet quotes about 12.5% movement. Its alkoxy Triple Protection sheet quotes 25% movement and a natural-stone line. None of these tubes is that neutral product. EN 15651 is named only on the two general-purpose cartridges. Everbuild’s family sheet quotes ±12.5% movement, joints from 4 mm to 25 mm, depth no more than half the width, and about 10 metres from one cartridge on a 6 mm bead. Do not copy those figures onto the 70 g tube or a strip.

Pack size, date, and the listings

A full cartridge here runs from about £5.00 to about £7.69. About 10 metres of a 6 mm bead is a slim bath joint, which 70 g will not cover. Everbuild states 24 months from manufacture. Reviews on the white general-purpose cartridge mention an expired date and a stamp about 26 months old. The sanitary title says 295 ml and a bullet says 310 ml. The general-purpose titles say 260 ml and a field says 280 ml. Do not average them. When the type is clear, the best bathroom silicone page says who each pack is for.

Common questions

Is general-purpose silicone acceptable around a bath?
The white and clear general-purpose cartridges both carry an anti-fungal claim, and the clear highlight mentions bathrooms. The product name is still general purpose. For a full bath or shower, start with the sanitary cartridge if you have a gun. A general-purpose cartridge is a reasonable household and uPVC seal when the joint is clean and dry.
What does a vinegar smell mean?
It usually means an acetoxy cure. Acetic acid leaves the bead while it skins. Ventilate the room, and keep the paste off sensitive surfaces. If the odour is intolerable, or the surface is natural stone or some bare metals, you need a neutral-cure product. This shortlist does not contain one.
Can I use any of these tubes on a marble or granite worktop?
No. Ordinary acetoxy silicone can stain the edge of porous stone, and Soudal describes that mark as permanent. A neutral cure is not automatically a stone silicone either. The sheet has to name the stone. None of these eight listings is a stone-rated neutral silicone, so a clear kitchen tube is the wrong shortcut.
What is EN 15651 for a buyer?
It classifies non-structural sealants into façade, glazing and sanitary parts. Seeing it on a listing tells you the seller has named a class. It does not replace the joint width, the cure, or a fungicide claim. In this set it appears on the two general-purpose cartridges. Absence on the sanitary file is a gap in that listing.
Cartridge or squeeze tube for one tap?
Use the 70 g 151 tube at about £3.35 if the job is a tap or a short frame and you do not own a gun. Reviews say it is hard to squeeze and can dry in the nozzle. A cartridge is the better buy for a bath length, because one Everbuild-family cartridge is stated at about 10 metres of a 6 mm bead.
Clear or white: which is more waterproof?
Neither, on the evidence in this set. Colour is colour. Waterproofing and movement come from the formulation. Choose white when you want a bright line you can see and clean, and clear when the bead should disappear against glass or a pale surface. The clear general-purpose cartridge is £1 more than the white one in this snapshot.
Can I paint the silicone afterwards?
Do not plan to paint the silicones in this comparison. Standard silicone is not a decorator’s caulk. If the bead must take emulsion, buy a paintable sealant whose own sheet says so. Painting over a silicone bead in the hope it will hold is a common way to waste an afternoon.

Related pages

Mould resistant bathroom sealant

Silicone or a sealant strip

Sealant

Best bathroom silicone sealant: who each pack suits

How to apply silicone sealant: cut, tool, then wait

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.

  1. Sika Everbuild general-purpose silicone (retrieved 22 October 2026)
  2. UniBond sanitary silicone sheet (retrieved 22 October 2026)
  3. UniBond Triple Protection sheet (retrieved 22 October 2026)
  4. Soudal UK acetoxy and neutral-cure FAQ (retrieved 22 October 2026)
  5. Soudal UK silicone on natural stone (retrieved 22 October 2026)
  6. Soudal sealing strip technical data sheet (retrieved 22 October 2026)
  7. GOV.UK damp and mould (retrieved 22 October 2026)
  8. GOV.UK construction products (retrieved 22 October 2026)
  9. BSI EN 15651 series (retrieved 22 October 2026)