Hi again. I have searched the forums, but have not seen what I want. I have an older piece of foam rubber from a car seat. I have tried grinding it with various tools, but can't get the effect I want. I think that if the foam rubber was a bit harder it would work. I remember in the long ago, having some of this that had almost crystalized. I wonder how to make my current foam rubber harder. Any ideas for quickly deteriorating this material? ps: omrick means "Old Man Rick"