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Thompsons 10 Year Roof Seal Black 4L

4.7 (379 reviews)
SKU: 240301134514005 EAN: 5010214801466

Compare 4 prices for Thompsons 10 Year Roof Seal Black 4L — from £34.99 to £46.95 across 4 UK sellers including Screwfix, B & Q, Tooled Up and more. Save up to £11.96 (25%).

£34.99 6h ago
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Compare Prices from 4 Sellers

Prices updated 19 Apr 2026
2
B & Q
£35.00 +£0.01
2h
3
Tooled Up
£46.95 +£11.96
0h
4
My Tool Shed
£46.95 +£11.96
0h
#2 B & Q
2h ago
£35.00 +£0.01
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#3 Tooled Up
0h ago
£46.95 +£11.96
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#4 My Tool Shed
0h ago
£46.95 +£11.96
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Get your flat roof ready for bad weather with Thompsons 10 Year Roof Seal – it seals up any damaged or worn areas, repels water molecules and adds an extra binding strength to the surface. As a result, it''s commonly used on felt roofs for sheds, but will also work on asphalt, slate, tiles, concrete, brick and corrugated metal. It helps to keep the inside of your shed well insulated and free from drips or leaks.\nThe roof seal has excellent UV resistance, meaning the deep black colour won''t fade in the sun. After six hours, when the first layer has fully dried, a second coat can be applied, which provides extra protection from the rain.\nThompsons Roof Seal has a malleable formula that moves with the roof, so it prevents cracks from appearing and stops the surface from flaking in the heat or cold.\n• Repairs your flat roof to get it weatherproof\n• Suitable for use with felt, asphalt, slate, tiles, concrete, brick and corrugated metal\n• Outperforms standard bitumen paint\n• Flexes with the natural movement of the roof\n• Resists the sun’s UV rays, so colour won''t fade\n• Rainproof in six hours\n• Coverage of approximately 0.5m² per litre
Brand Ronseal
Colour Black
Type Roof Seal
No features listed
No items listed

Customer Reviews 379

4.7
379 reviews
5 star
320
4 star
32
3 star
6
2 star
5
1 star
16
Does what it says
5.0
February 18, 2026
HP26 Verified Purchase

Easy to apply and sealed the roof pretty good. Used a roller.

Thomson’s 10 year roofseal
5.0
February 3, 2026
e96a3a43-43db-5791-a5f5-def5544449c1 Verified Purchase

Easy to apply and brush cleanup with water. Had to use urgently on flat garage roof at a temperature below the instructions, but still made a marked improvement. Will give a second coat when the weather improves!

Runny
1.0
January 22, 2026
aes5pd0cqrs6p77et1otahjn6

I bought one 3 weeks ago had a leak on garage felt roof. Waited till a dry day in the morning . About 8 c mixed up and painted on About 1m. Square. Next day went in and it all had run off roof on the floor. It had rained that night.. it was everywhere mixed with water. Took it back to toolstation Alder rd bh12. .they didn't want to know .said I shouldn't have put it on under 10c .. just looking for excuses.. .so much for there 1 months money back guarantee. Only wanted to swap for something that worked. .so I purchased blackjack roof seal that works well. Not impressed with toolstation. £35 out of pocket.

Paint
5.0
December 2, 2025
The older one Verified Purchase

As always does what it says on the tin staff very good

Unorthodox use but works a treat
5.0
October 26, 2025
Pretty ace Verified Purchase

Well we have had a few problems with a polycarbonate conservatory roof after next-doors aerial punched a hole in it followed soon after by 2 house bricks that had been used to hold down soffits Instead of being clipped into place properly
Repaired holes as best we could sticking perspex pieces over holes and cracks but couldnt stop persistant leaks
Used thompsons 10 year roof seal using 2 coats using a small roller and brush to completely cover the whole roof has completely repaired the leaks even after torrential rain
Intend to do another 2 coats with the grey version to reflect heat as soon as a suitable dry day comes around

Concrete flat roof.
5.0
October 3, 2025
Jimbo B Verified Purchase

I put this on an old flat concrete roof. Two coats and the leaks seem to have gone away.

Thompsons 10 year roof seall
5.0
September 11, 2025
a0e0s9xp3gaq2s8zo1fqllhj8 Verified Purchase

Great ptoduct painted flat roof over a weekend went on no problem

Thompsons 10 year roof seal.
5.0
September 3, 2025
Chris Handy Verified Purchase

Have been using Thompsons Roof seal for the past 4 years on a large flat roof. Started with seams and repeated to cover complete. No leaks considering the amount of rain.

sealed well
5.0
September 1, 2025
Gary S Verified Purchase

have used item before excellent and this tin was good value

Excellent product
5.0
July 31, 2025
913f57c4-25e6-5108-8e0c-41393d82390c Verified Purchase

Excellent product, have used before, does what it says on the tin, would highly recommend.

Now leak free
5.0
July 30, 2025
Bobbyt82 Verified Purchase

Excellent product, only just applied so it hasn’t stood the test of time but it seems to do as it says on the tin so far, leak free roof.

Good product, would buy again.
5.0
June 15, 2025
e52ba32b-6569-5b2b-928a-97340ad4049d Verified Purchase

Easy to apply, good coverage and stopped the leak, even though it was on a rough concrete surface. Did apply several coats on the areas with cracks though.

I used Thompsons 10 Year Roof Seal for the first time to stop a leak in my shed's flat roof
5.0
June 1, 2025
Napa Verified Purchase

I used Thompsons 10 Year Roof Seal for the first time to stop a leak in my shed's flat roof and so far it looks to have done the job.

1
5.0
May 31, 2025
Dat 1 Verified Purchase

So far so good been good in the rain that we have had will see how it does in the winter

Quick and good
5.0
May 27, 2025
B Ronnie Verified Purchase

Stopped the leak and was easy to apply, great value for money.

Thompsons liquid rubber
5.0
May 19, 2025
Steve of Leeds Verified Purchase

Covers felt very well. It also covers metreage stated on tin. Would definitely recommend.

Flat roof cure.
5.0
May 7, 2025
Cornish DIY Verified Purchase

Expensive but well worth the money, very happy customer. Dried very quickly too.

Value product
5.0
May 3, 2025
6b91a009-072a-5738-8537-f21407664e02 Verified Purchase

Good quality and easy to use quickly and no mess easy clean up with water

LEAKS SHALLL NOT PASS!!
5.0
May 1, 2025
Stuart14 Verified Purchase

Really good stuff use this all the time now. Recommend to all my co workers

Water tite.
5.0
May 1, 2025
kiu Verified Purchase

my shed roof is felted and allways in the sun so felt deteriates os i have tried thomsons roof seal , i have used there brick sealer with good results so keeping fingers crossed.

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