Dan wrote:
I agree. The DB170 is great but it sure does stretch out of shape
easy.
If nothing else, the mat helps to keep the shape of the material.

Trying to use mat with epoxy is not only a complete waste of good
epoxy, but it also adds dead weight.

But, if it makes you happy, so be it.

OTOH, mat is a must if using polyester.

Lew