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I would not recommend stripping anything down to bare metal without being able to immediately put on an epoxy or etching primer. Rust will begin to form as soon as the old paint is gone, especially if exposed to the weather.
What are you stripping the parts with. If you're going non-liquid, like sand or media blasting, the parts should be fine as long as you keep them completely from the weather.
I had our cab sandblasted for about two months before I got a chance to put anything on it. We kept it in the shop and away from any weather. The only places that started to surface rust were where Steve touched it while making his dash mod's. The smaller parts I blasted and stuck up on a shelf still look freshly blasted.
As for the primer. Since you're taking it to the metal, I Ospho'd ours first to take care of any small rust particles that may still exist, then you'll need to put an etching primer on, then the epoxy primer. Still, keep it out of the weather.
oh i thought i was too bring it down to metal to check for filler and for better paint adhesion. should i just scuff the pait and repair sections that need to be fixed
There are many schools of thought on that... Some prefer to go all the way down to metal and fix everything, to make sure that it was done properly, or to just block the vehicle and repair any spots you find. Would really suck, if you spend all your time fixing and painting this vehicle and two years down the road...bondo bubles appeared from a previous repair... If Stripped to metal.. you know whats under it, and also that the paint isnt too thick.