Third summer with an Intex 15'x42" pool. Been having trouble with the inflatable ring holding air. Patched a few holes I found and it was holding for about 2 days before I needed to add more air. This morning I woke up to a small flood in the backyard. The ring was completely flat and collapsed and water was pouring out over the edge. I filled with air and it went flat again in about 30 minutes...the problem is the actual valve stem wont seal. Any ideas? I am only going to use this pool this summer....was thinking of just filling the ring with spray foam.......think this will work?