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The primary purpose of a primer is to prevent rust and corrosion. Epoxy primer 3 coats does seven, eight hundred hours of salt fog testing before it begins to deteriorate. It seals off the moisture but not the oxygen, that's why it begins to rust. Aluminum Pigmented moisture cured permanent rust sealer does 8000 of salt fog testing. This is the only type of primer that cuts off both the moisture and the oxygen. apply two coats and then a surfacing type primer either urethane or an epoxy. This will level up any pitting and should last several years. Will this truck be garage kept or parked outside ?