ask the place what the after-spray is, if it's phosphoric acid [should be], ask them to be liberal with it, including spraying inside the rear body cavity thru the little covers in the sidewalls - be a good idea to drill some holes in those panels on the inside below the floor level so the cavities there drain well, they can be plugged later - phosphoric acid treatment will last a long time if kept totally dry, Florida humidity may defeat it
if the whole thing is well treated with phosphoric acid [Ospho as CASO says], epoxy will work, the trick is to make sure all the pinch welds are flushed out well so no stripper chem bleeds out under the primer - but you shouldn't count on doing your welding after epoxy unless you're also prepared to strip the epoxy off the area to be worked
Bill
