Best liquid rubber
Updated: 23 October 2026
You already know you want a waterproof coating, not a mould and not a bottle of latex. The leak is a gutter joint, a small caravan patch, or a shed of a few square metres. The best liquid rubber is the tin whose coverage and gap limit match the patch you can measure. A 1 litre coating is the wrong buy once the area is several square metres. The [liquid rubber comparison](/hub/fillers-adhesives-and-sprays/liquid-rubber) holds the full set. A qualifying purchase through our links can earn us a commission at no extra cost to you.
You already know you want a waterproof coating, not a mould and not a bottle of latex. The leak is a gutter joint, a small caravan patch, or a shed of a few square metres.
You already know you want a waterproof coating, not a mould and not a bottle of latex. The leak is a gutter joint, a small caravan patch, or a shed of a few square metres. The best liquid rubber is the tin whose coverage and gap limit match the patch you can measure. A 1 litre coating is the wrong buy once the area is several square metres. The liquid rubber comparison holds the full set. A qualifying purchase through our links can earn us a commission at no extra cost to you.
Our top picks
| Badge | Product | Best for | Pack | Stated limit | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Gorilla Gorilla Waterproof Coat & Seal, black, 473 ml | One joint inside 6 mm | 473 ml | Not a whole roof | 9.0 | about £19.30 | View offer |
 Gorilla Gorilla Waterproof Coat & Seal, black, 946 ml | Several local patches | 946 ml | No large areas or flashing | 9.0 | about £30.20 | View offer | |
 Tapel Tapel liquid rubber roof coating, white, 1 L | About 1 m² of metal, wood or concrete | 1 L | Not a 5 m² shed | 8.0 | about £19.99 | View offer |
On this page
Best for one joint, not a roof
For one gutter joint inside 6 mm, the black Gorilla 473 ml tin is the match, at about £19.30. The UK page limits it to gaps up to 6 mm and bars large areas and flashing. A brush-on patch is often dry in about 24 hours, with a full cure of 24–48 hours at 10–48 °C. The 4.5 from 2,378 reviews is shared with the 946 ml tin and includes clear-coat comments, so buy the black title. This smaller tin is the best value, because the larger tin costs more for the same star line. Move to 946 ml at about £30.20 for several local patches, not a flashing or a pipe under pressure. Tape, not more liquid, is for a gap of 6–99 mm. If you are not sure this is a coating, use the liquid rubber buying guide.
Best 1 litre tin in this set
For about 1 m² of metal, wood or concrete, Tapel’s white 1 litre is the polyurethane row here, at about £19.99 and 4.0 from 459 reviews. Some buyers stopped a van-roof leak or brushed a dry shed. Others found the tub watery, needed about four coats, or still had a leak. A pool-floor coat lifted when the pool was filled. The tip says 10 °C or above, and damp-surface and dry-surface lines both appear. ASTM G154 and EN 1504-2 have no certificate. At about 1 litre per square metre this tin is about 1 m², not a shed. Rate and cure are on how to apply liquid rubber.
When the best buy is 5 litres
A sound shed of about 5 m² wants a 5 litre trade coating near 1 litre per square metre, not a stack of gap tins. Skyguard is the reference: weathered felt, asphalt, GRP, concrete and suitable metal, touch dry in about 6–8 hours at 20 °C, full cure up to 7 days. Rubber4Roofs listed 5 litres at £45 from £54. On 21 October 2026 a separate amazon.co.uk listing showed Skyguard 5 litre grey at £64.99, with 5.0 from 10 reviews. Do not add that extra listing to the scored table. “Up to 10 years” is the maker’s figure at the stated rate, not an independent test. If the area is still one joint, 5 litres is the wasteful buy.
What a ranking cannot fix
The right tin still fails when the roof holds water or the gutter is the wrong plastic. Skyguard bars inadequate fall, ponding, plastic gutters, new bitumen, new lead, ponds and indoor use. A coating does not create a fall. Gorilla can fill a uPVC joint inside 6 mm and still refuses a large area and a flashing. Call a roofer when water sits after rain, the deck feels soft, or the leak is a flashing.
Common questions
What is the best liquid rubber for a sound shed of a few square metres?
A 5 litre trade coating at about 1 litre per square metre, such as Skyguard, for a roof that already drains. About 5 m² is about 5 litres before a porous extra coat. Gorilla’s tins are gap coatings. Tapel’s 1 litre is the small polyurethane row here, not that shed.
Is Gorilla 473 ml the best tin for one gutter joint?
Yes, inside 6 mm, at about £19.30, with gutter on the surface line and 4.5 from 2,378 reviews. The UK page also limits large areas and flashing. The reviews are shared with the 946 ml tin and include clear-coat comments, so check the black title. A wider split wants tape.
When is the 946 ml Gorilla tin worth about £30.20?
When you have several local repairs, still not a whole roof: gutters, uPVC, a small caravan patch. You pay about £10.90 more than the 473 ml tin for the same 4.5 from 2,378 reviews. It is the wrong spend for a single joint, and the wrong product for flashing or a pipe under pressure.
Is Tapel’s tin a roof coating for 1 m²?
It is the polyurethane row here, white, 1 litre, 4.0 from 459 reviews, for metal, wood and concrete. At about 1 litre per square metre it is about 1 m². Reviews disagree on thickness. EN 1504-2 and ASTM G154 are seller lines without a certificate. Damp and dry instructions conflict.
Should I leave amazon.co.uk for a 5 litre tin?
Leave the 1 litre and gap tins in this set when the sound area is about 5 m². Rubber4Roofs showed Skyguard at £45 from £54. A separate amazon.co.uk listing showed £64.99 on 21 October 2026. Compare the rate and the exclusions, not the word rubber. This page does not score that extra listing.
Which pick fails if the roof ponds or the gutter is plastic?
All of them, in different ways. A Skyguard-type sheet bars ponding and plastic gutters. Gorilla can be used on a uPVC joint inside 6 mm and still refuses a long coated run and a flashing. Standing water needs a fall, which a coating does not paint on.
Related pages
Sources
Public UK sources used for this comparison. amazon.co.uk prices, stars and review counts were taken from the listings on 19 October 2026.
- Skyguard liquid rubber data sheet (retrieved 19 October 2026)
- Skyguard 5 litre liquid rubber (retrieved 19 October 2026)
- Gorilla Waterproofing Liquid Black (UK) (retrieved 19 October 2026)
- Bostik Waterstop flexible waterproof coating (retrieved 19 October 2026)
- HSE paint and coatings FAQ (retrieved 19 October 2026)
- HSE latex allergy (retrieved 19 October 2026)
- Bauder on BS 6229:2025 (retrieved 19 October 2026)
- Assimilated Regulation 1935/2004 (retrieved 19 October 2026)
- Plasti Dip liquid electrical tape (retrieved 19 October 2026)