Polar Premium Black Tape 4" x 5ft Instant Waterproof Seal Interior & Exterior Ideal for Doors, Windows, Roofs, Gutters and Pipes, Self Adhesive & Flexible

Stopped my leak instantly!@

Absolute waste of Money. It doesn't stick. Yes, cleaned the surface as best possible but next day gaps all over. Doesn't even stick let alone waterproofing. Used already so can't return or get my money back. Very Frustrated.

I used this product to patch the roofing felt on my shed. It is an excellent product, fairly easy to use although sticky of course and it looks neat when finished but.... 24 hours later there was a good ½ inch shrinkage at either end of the strip I'd used. The width remained unaffected. I did the repair on a hot day so whether the heat caused the shrinkage or whether it would have happened anyway, I couldn't say? But if like me you plan to use it outside in an exposed location then it's going to get hot at some point throughout the year and so when measuring the amount you need to cover make sure you add extra at either end. Also the roll is advertised as 5 feet long. Definitely shorter, more like 3 feet (I think a previous reviewer also commented on the short length) But even with all that said, I do recommend this product!

It's been months of rain, heat, and construction dirt. Still, where I'd oversized and can touch the adhesive side It's still sticky- in a good way. The membrane is quality material and should seal well. I used it atop existing post as part of a redecking and only after I'd let them dry. Being spring in KY it always rains. I used foil tape to tent over the post in the interim.

Stuck some patches of this on my shed roof to do some patch repairs. Was super sticky and seemed good when i applied it, but within a month it seems to have started lifting and peeling off. - Thought i'd get more than a month of use out of this tbh.