I recently purchased a decent blast cabinet. I'm wanting to learn how to Etch glass. I made the mistake of getting 80 Grit Glass Beads. They were to aggressive for small lettering on glasses. Will I be ok if I went with 150 Grit Aluminum Oxide? What pressure should I be at? I was running 80#. I think I was probably using to high of pressure and to aggressive grit. What are your thoughts? Am I thinking right or do I need to go with an air eraser. Thanks. Steve