I've heard that knives should work just fine but it seems like I'm bout to break my blade when I try. Any alternatives that are easier?
I had great success mixing different brands/strengths of cream glass etch from Michael's Art Supply put in one of they're proprietary blank wide pens but don't go around hitting in store deli cases with it drunk off 4Loko or you risk suffering the wrath of the neighborhood Taliban.
Glass and tile drill bits. They are a little short and awkward to hold but they cut nice clean lines without much effort
Is there anyway to turn etching cream -> etching fluid. It'd be quite a bitch to try and make it myself with hydrofluoric acid + all the safety additives. Just throw it in some water or ethanol or something?