I have blasted lots of stuff with that same unit, it works well. I like the black diamond fine grit from Tractor supply. You have to have clean dry consistent grit or your going to clog right up. I got a sand sifter from a prospecting supply to clean and reuse the sand, it works great and I've cleaned it several times ( I have a huge tarp from harbor freight ). Silica sand is very hazardous to your lungs I don't use it anymore. Even with the black diamond I use a supplied air set up.