Review on Enhance Your Projects with Glass Bubbles Filler Epoxy Polyester - A Superior Filling Solution by John Clark

I used to work with fiberglass and gelcoat. No glass microspheres were used to thicken to use as a filler. This stuff works great. Easier to sand than no-ball gelcoat and just as durable. Hate glue and don't want to use it? Try it. In a respirator, by the way. This substance is like dust, and you don't want to breathe in microscopic glass beads.