Don't see why it wouldn't work. I recently patched a 2" slot/tear in a liner in a fountain pond. When I went to Cindi's DH, the roofer, to get the patch stuff, he didn't ask me what weight liner it was. He just handed me the self stick patch strip, a brush to apply the solvent and said to put a lot of pressure on the liner when applying the solvent like I was scratching the liner with the brush loaded with solvent, and a roller/brayer to press on the patch with. If you can get a piece of flat something like plywood under the area to be patched first, it is easier. Makes it nice and sturdy. I also like to patch both sides of the area if I can get at it. That way you're sure it stays patched. Or what I did was apply a small patch, let it dry and then patched over that with a larger patch because I couldn't get at the backside of the liner. It's still holding water.
