Yes, this is true. It has been proven that if you use to high a heat source to make a ball "sweat", it can also sweat out the resin from the cover. There are better methods to rejuvenating your bowling ball. One is the Ebonite Hook Again and the other method is the CPR by Columbia 300. If you do use a heat source, it must be a very light heat source, just hot enough to get the ball to sweat even though that method is still not advised. Also, for future reference, wiping your ball down with rubbing alcohol after each bowling session greatly reduces the oil absorption by the ball thus keeping your ball performing at an optimum level over a longer period of time.
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Steven Vance
Atlanta (Buford), GA
Pro Shop Operator
Advanced Bowling Solutions
If anyone out there is worried about the scores being too high, try duckpin!!