I purchased the "Medium" blast cabinet from Eastwood and I love it and use it all the time. It is not big enough to get a fender in it, but I have blasted things bigger than my blast cabinet by duct taping a large heavy trash bag to one end of the cabinet and then blast half of the piece at a time. I buy aluminum oxide and glass bead from a local supplier, but I use the aluminum oxide the most.
Bill, Where did you get your cab blasted? I live in Williamson NY, and I have not been able to locate anyone local to do large items like a cab.
