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It really depends on the car ,for instance if its a 69 camaro your restoring you would sand off all the primer and use a good quality epoxy that you trust....if its just a daily driver you would just scuff with a red pad spray some adheasion promoter and shoot it..After market sheet metal has crap primer on them, OEM sheet metal has pretty good primer so that can stay on...basicly aftermarket parts get the primer sanded of and the jambs just scuffed and sprayed with a light coat of adheasion promoter (bulldog works fine )
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