Just thought I would throw something else out there (in response to ktownscroller's post). When I have cut aluminum, it mostly has been PPW (pre-painted) .050 aluminum. It's usually coated with a plastic cover on the painted side, so that when done, you just peel the coating off and it's good to go. I usually file the back with a fine file, which shines it up. Also, when cutting metals, found that if you use the #1 or #2 jewelers blades (I get mine from Sloan's Woodshop online) and don't push it too much, they work very well. Just be warned....when the blade breaks, and yes, 90% of the time it will before getting dull enough to change out, it will 'definitely' get your attention! Good luck to all that try