yes, if you want a fine media then buy a fine media or use the stuff in your cabinet until it breaks down and it fine. dont improvise. certain substances can get dangerous and extremely hazardous when blasting with them. sand is a prime example. never blast with sand. while we are surrounded by it every day, its super toxic to blast with. as the grains break when they hit the surface they will give off a gas that will kill you. i have a crushed glass here that is so fine its like baby powder. very nice for special uses like what we are talking about here.

lambda....yes thats the thread. not sure how i missed your post.