HPRSBL4L Thompsons High Performance Roof Seal Black 4 Litre

Sealed shed roof and despite torrential rain storms since applied has worked flawlessly. Easy to apply with good coverage and adhesion despite being on sloped shed roof. Not the cheapest but the surface finish and results worth the cost.

This stuff is brilliant! I built a very large shed several years ago and used good quality roof felt but a few cracks were appearing at the roof folds. I The roof is approximately 14 square metres and this tin covered it perfectly. I could not believe how well it filled the cracks and provided a new skin. It also looks fantastic.

I started to use this product a few years ago to paint onto the flat roofs of two bay windows which had previously let in water. I buy a tin of this every three years or so and apply a couple of coats. I've never had problems with water ingress since using it, but even though I follow the instructions to the letter, after a couple of years it starts to peel off in places and eventually new coats must be applied. I don't mind that so much, as I am just painting a relatively small area and I treat it as essential maintenance. The product is easy to use (I applied it with a brush) and provides good coverage. I expect it to prevent water getting into my property, but I certainly don't expect it to last 10 years - it never does!

Easy to apply and works well.

This works very well on flat roofs, unless you have a bad leaking roof you only need to paint the joins as that is where they will usually leak especially on garages.