Getting a ball too hot is certainly not healthy for it. But when using our Revivors and in accordance with our recommendations, they will not cause any harm to a ball. The air is only warm enough to pull absorbed lane oil to the surface of the ball and does not affect the ball's internal temperature. Only the outer most surface of the ball is warmed during our process. Through the years various competitors have stated that our Revivors are not the best process for removing lane oil from cover-stocks. That statement is not and has never been true. In the early days, Brunswick performed a scientific study of our process and their research proved this isn’t true. A copy of that study is available upon request. Any bowling ball that has spent a few hours in the trunk of a car, during a hot summer’s day has been exposed to much greater risk than a short visit in one or our Revivors.