bead blast sand substitute

I am using #0/30 monterey beach sand. 10 bucks per 80 pounds. Works splendid for general purpose sand blasting. I have not tried it on undercoating. I am using a medium sized tank type sand blaster running at 100 - 120 psi with a 16 cfm @ 175 psi compressor (13hp / 3 cylinder).

I have heard that recycled ground glass is the absolute best for blast removal of undercoat and tough coatings, rubberized, epoxies, or greasy. Wish I could find a source for such near where I live. My friend in the midwest fully restored 2 B bodies to conquers quality and had stripped the undercarriages with crushed recycled glass, said it is the best...