Sealant for large temporary underwater repair (vinyl pool)


Well-known member
Sep 6, 2008
My (2nd) liner has failed in one corner. Liner installer repaired it twice with some sort of silicone that apparently cures underwater. Unfortunately the liner fit so poorly in the seam where the floor meets the wall that it was always under strain from the water weight. So...the repairs failed and the damage got larger each time. I'm now trying to patch a rounded corner about 30 inches long. I got a repair piece from the liner manufacturer that's plenty large enough but have had no luck getting any of the stuff I've tried to adhere under water. New liner going in but installer wants the water clear so that he can get accurate measurements. So this repair doesn't have to look good, it just has to hold water. I'd pump the level down another 6" to get the water line below the repair but my mains are blocked from looking for a leak (separate issue). I could rent a pump but if there's another way to patch this gaping hole, I'd love to know what it is.



Mod Squad
LifeTime Supporter
Jul 10, 2012
Tallahassee, FL
How large is large? I wonder if you could do a part at a time? Anything over the size of a hand will be too hard to handle and get it to stay.