What is EPS blank "tear out" I hear about?
Tear out is nothing to "worry" about. It is part of the process of shaping EPS. Our foam is the tightest bead bond in the industry but you will still get some beads that pull out. The idea of shaping EPS to to rip into it with the most aggressive tools to remove the foam them go over it with finer grits of sandpaper or sanding screen to close the small bead voids up.
If you are painting or doing a resin tint it is advised to apply a thin coat of lightweight spackle on the board to make it a clean, bright white surface to have even color.
A clear glass job or opaque pigmented resin lamination does not require spackling.