Nashua 3 in x 15 ft Aqua-Seal Waterproof Tape in Black

I have water fountains on my patio and the one I first bought had a leak in the seal and it's rather large and the other ones even larger and from over the years the bottom cracked out all I had to do was put it over it underneath outside of it and it's stuck in the water stays in and it doesn't come off once you stick it that's it it's great

Just used to seal pond liner. Seems to be a great product.

This is a great product and sticks very well. Be careful that it doesn’t fold over on itself and you waste a bunch.

Great tape multifunctional even in water wow. Works great. Thanks

This tape sticks very well, is quite elastic and seems to be holding up well to sun and rain.

Trash! This product started off strong held great but after about 8 months on my indoor pond it failed. I had several sections two to three inches long where the tape had failed and come loose. Would not recommend for anything. If you're trying to seriously waterproof anything I recommend just spending a little more money. For the sake that it cost me roughly $33 to reseal my indoor pond. Not to mention the damage that could have been caused had I not noticed the drop in the water levels and drain the pond before catastrophic failure.

This is sold for underwater use, and may work in many cases and for many uses. I used it in a 100 gallon fish tank, and it failed miserably. It stuck only for a day, and (probably coincidentally) all of my 9-inch goldfish (properly termed carp) died within two days. They were years old. No, I did not introduce ANY other substance, device, etc. to the tank at that time. I do have to admit that nowhere on the label, etc., did it say it was safe for use in a fish tank.

This is the first product I found (after many tries) that actually held up under water. I was skeptical since so many others had failed, but I taped up the leaky areas, filled up the pond, and it holds water! I am thrilled. Great product.