When I was painting bikes I would send my gas tanks to this guy, and he would powder coat the inside of the tanks to prevent rust, instead of using the kreeme stuff that will fall off after a while. He does tig welding to repair holes and such, and has industrial grade equipment, and an over big enough for a chassis.
Tom at Carolina Custom Powdercoating
Off woodwinds Industrial Ct. in Cary
919-460-9600
Great guy, and his work is better than the larger companies I've seen in the area. http://carolinacustompowder.com/default.aspx