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the inner boxes areas of panels are not painted for the factory they are coated when the cars go thru there dipping proses of there undercoat . that is the only protection the inner panels would ever need as they last for years and years before the inner panels start to corrode . if the panel has a black or the gray e-coat primer on when you buy the panel that is all it needs to last just as long as it does from when the car was built it the factory . you have to remove the part of the e-coat when you weld the new panel on were it meets up to the joining panels . so all you have to do is spray or brush a weld primer on that area were you stripped off the e-coat to do your welding .
if you buy a panel that comes in just a galvanized coating on it take a red pad and scuff the inner part . then spray one to two coats of a e-primer (etch or epoxy ) . let the primer dry then remove the primer to bare metal were it meets up with the joining panels and coat what you strip the coating off with your weld primer in just the same way you do for a precoated replacement panel . from there once you do all your welding you could used a cavity wax .
what we would do quite often is use rust-shield with a the cavity wax gun and spray the rust-shield down the insides of the panels .
if you have no access to the inner panel once you have it welded and it's completely boxed in you will have to do all your inner coating before your welding is finished . that you would do in the same way as if your dealing with a pre e-coated replacement panel .
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