blaster!!!!

could someone explain blasing to me, i know how they work n all but I have about 7 45-53 pickups i'm wanting to start working on, ive bought a welder brake bender couple other tools, and now i'm looking into a blaster. i'm wanting to use a clemco pot blaster or somekind, but i dont know what size or kind of compressor i'll need. if i'm blasting a body or frame, i dont guess you need the compressor to run alot during this right? i'm unsure about how it works only been around blast cabinets so any tips help anything about this would be great ,