Originally Posted by bertro
... Does anyone Know of a product that will remove primer and not clearcoat.I dont have any idea why this was done other than mabey some clearcoat blistering as it does get hot ...
Primer and clearcoat, while different, have a chemical composition that requires strong chemicals to remove them. The only way one can be removed without damaging the other is through careful masking and chemical application. So I think you are hosed as far as a wunder-stripper is concerned.
As far as why
someone primed that area, it is possible that the furnace failed and started blowing flames out the exhaust port. The intense heat may have ended up mottling the aluminum. The furnace port on my 40 year old Overlander shows no heat effects.
Until you are ready to polish your Airstream, you may want to leave the primed area as-is; the aluminum the primer is covering might not look too good.