The foam works. It sprays, the can had sufficient product for my use. The problem is that the applicator would not stay on the can. As a result it was everywhere I didn't want it, on the surface of rocks, on the liner, on my arms and legs. Luckily, I had gloves on, but it was on my feet, under my feet before I knew it, then more got on flat rocks. When I got in the shower it was all over the back of my thigh! How it got there I'll never know. I had to hold the applicator on as I used the remainder. But now, as I need more, it has bubbled up all over the can, so I'll have to by more. At $23 I'll try something else. UGH!