My expensive Spalding leather volleyball was puntured when it was hit into a thorn on a tree branch. I had hoped the ball sealant might rescue the ball. I followed instructions, and ended up injecting what should have sufficed for two balls. The air pressure held fine through the night, and during about 3-4 games of volleyball. I was delighted. But then laid the ball on the grass while we were using another ball for a couple of games. When I went to take the ball home, I found it was very soft. Pumped it up several times, but it would not hold pressure. I ended up taking the ball apart to examine the small pin hole. The sealant should have worked, but didn't. It was a waste of money, except for learning what doesn't work. 1 star