[RockHQ]

Like the others said, sandblasting will warp all the thin panels if done by a shop (they'll use high pressure&volume to make it fast&easy). However you can sandblast panels without warping them (very low pressure, fine grit sand, shot at a low angle) but it'll take forever and will be a messy deal. While on the subject of electro-coating i'm pondering whether or not i'll have my cab electrolytic zinc galvanized. Won't be as good as hot galvanizing but better than what paint alone can do.

Also, AFAIK powder-coating is done by connecting the part to be coated to the negative side of a DC power supply (anode) and the spray gun to the positive (kathode) side, the sprayed powder attaches to the part because it's electrically charged, then the part is cooked in an oven to melt the powder. The result is a very good bond between the powder and metal. Ok i'll stop rambling now.