WD 40 is Horrible to prevent rust. Gibbs Brand is better. No Silicone.
What we have been doing so we don't have to blast the car twice and thin the metal is paint strip the car Chemically in the beginning. Perform all you mods and then send the car out to be blasted and epoxy primer in one shot. This ensure no rust is missed in the primer process to rear it's ugly head in the future. Another method is to Acid dip the body in the beginning with a good stripper who knows how to Neutralize the body after the dip and then Perform all your work. We have found not blasting the body slows the deeper rust build up because the sheetmetal is not rough and open up like blasting does.
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