Polar Specialist CoatingsPolar Premium Leak Seal Clear Paint - 500ml - Instant Waterproof Roof Sealant - Ideal for Leaks, Cracks & Roof Repair - Concrete, Brick, Metal, Drainpipes & Gutters - Easy to Apply

It works! After trying silicone etc to fix a few cracks in my water feature to no avail, I used this as a last resort before I was going to take it to the tip 🙁 but it worked perfectly. After painting it on it dried within an hour in the sun and doesn’t need a second coat although one of the cracks was quite big.

This was applied to a felt roof which had had a small leak - being transparent, it doesn't seem too obvious but it does add a more reflective coat so does show under close inspection. Paint consistency is very thick, making it easy to slather on as per the instructions, while giving your brush hand a good workout! The surface remains sticky after drying so will tend to collect debris more. However (touch wood) it does seem to have worked so far in fixing the leak.The product safety warnings should be carefully observed. Even while wearing a facemask and outside, the fumes were noticeable. This is very much an outdoors product.

We bought this to seal an old fibreglass water feature which had sprung a slow leak. It was tricky getting the sealer into all the nooks and crannies of the pump sump, but that's not a complaint against the sealer. Imagine 'painting' a the inside of your hallway through the letterbox. As I was unsure whether my arm was long enough to reach unseen into the distant recesses and achieve a good seal, after a couple of days, I treated the bottom exterior surface too.A separate test on a small stainless steel dish with small holes torn in it was far more easily assessed, it sealed well with a dab of sealer on both sides. This is now used as a bird water dish.Both treatments have been successful and remain waterproof after three days use.Coverage thoughts - Given the nature of the fibreglass water feature task, I was unsure whether I'd be pouring it in and swilling it around to achieve a quick and easy seal, however, on opening the 500mL tin, it became apparent the viscosity of the sealer made this impractical - it needed to be painted on. For this I used an old brush I didn't mind discarding, since cleaning would be fraught with messy issues and time consuming. In total, I have probably covered about 1.5 square metres area, which has used just over half the 500mL tin. That might not sound like much, but it adhered to the surface and covered well - I was trying to achieve a decent thick coat, going much further than I thought it would.Should the need arise, I would definitely buy again.

Easy to apply - not had any adverse weather yet so cannot comment on how good it is

Would recommend

Good product for stopping leaks. Takes a while to dry but when it does excellent.

What a great product. Sealed, waterproofed and filled cracks in a single coating. Well done!

Had a leak in base of water feature 3 coats of this and all sorted