Any ideas of how thick of acrylic i should use? i have my sexy sandblaster to play with, and i figured, "hey i can etch kewl images with my sandblaster." the only problem will be finding something to "mask" the acrylic that i am not sandblasting, i was thinking of cutting a pattern out of a piece of 1/24th inch aluminum and set it over the acrylic. what do you guys think i should do, in going about making a pattern and how thick of acrylic i should use?