The ants love sugar as well, salt works the same and finer but you have to watch out for humidity with salt , it slows/stops the resin setting.
Anyone ever heard of sandpaper?
Logman just make sure that you seal the blank really well with a ben dover kind of mix

, sealing the blank needs a thickish coat. If there are any open scratches or gaps or small pot holes make sure that you fill them and then smooth the blank with about a 120 grit paper before glassing. Run your hands over the board to feel the smoothness. If you do this properly you will minimise/stop outgassing which causes bubbling of the glass coat.
Rod