Another bit of advice; use wax paper. Nothing like checking to see how your micarta has set up only to realize that it is permanently bonded to your press.
With epoxy.... use layers of protection:
wax paper, aluminum foil, wax paper, aluminum foil (all with enough room to deal with the extra epoxy that gets pressed out.
Any single layer might have a pin hole large enough for glue to bond to something on the other side.