Foam stains are great on EPS. There a two ways you can do them:1. Spackle the blank and add pigment to resin and squeegee on the blank, let it cure and laminate the glass on.2. Skip the spackle and mix Q-cell with the resin and pigment to a thin pasts and squeegee onto the foam. This will seal the blank at the same time as staining the foam. The white Q-cell will make the color a little lighter so add a bit more pigment to the resin and Q-cell mix. It's a good idea to always test the color on a piece of scrap foam or white paper to see exactly how it will look on the board before mixing in the hardener. Colors are much darker in the mixing bucket than on the board.