Join Date: Jan 2011
Location: Los Angeles, CA
Silica sand used for sand blasting, that's what I used. You'll find it at the kind of hardware stores that contractors use. They'll have different grit sizes so have them show them to you and you can pick the size you want. I think it only comes in 50lb bags so you will end up with a bunch of extra but it's super cheap, I still have half a bag that I bought almost 10 years ago.