Need some advice I fit a Caspian Trik Trigger to my Sig and had to take some off of sides now it has a polished look. Would like to return it to the frosted look what blast media would I need to do this saw 5 lb bag of glass media at HF is this to coarse? It was 40/70. Thanks for any information I have a small Snap On can blaster with a ceramic tip but have no media.