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.

Very good adhesion properties and good flexibility.

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.

I bought this tape at half price and it is still too expensive! Only 50 inches on the roll, not 60 inches as advertised! As far as how good it is, only time will tell. I cleaned the surface it was used on, but I had to warm the tape to get it to stick. It is not very flexible, so probably best used on flat surfaces, or wrapped around pipes etc. Expensive for what it is.