The following quote from another thread made me wonder about convential clay use.
Charles
What's to keep the contaminants you just kneaded into the clay from working their way back to the surface. Has this ever happened to any of you?97F1504x4 said:Ok i have a question about it. With clay it gets dirty as you use it you fold it over and kneed it into itself Yada Yada Yada. So how to you keep from damaging the paint surface with the cube since it appears that you can not kneed it like clay? Where are the contaminants going into the Cube? Is the cube disappearing as you use it?
Charles