GlobMarble Release form concrete release agent, Mold release agent, Concrete form release agent. G-1 CONCRETE MOLD RELEASE - G-1 CONCETRATED 30:1 FORMULA . 32 FL.OZ. (946 ml) Bottle, Makes 7 3/4 Gal (29.3L). Simplify Your Production Casting with G-1, GlobMarble Release. Minimizes Bug Holes In Concrete And Air Bubbles In Gypsum Castings Will Not Affect color surface detail or finishing Significantly Extends GlobMarbles Mold Life