anybody see a brown/beige sealer topcoat on their btm floors. this is off my orig e brake bracket- to be welded onto new floor pans early dec/69 production used a heat gun to remove heavy undercoating wiped down front frame rails with parts washer solvent and they both revealed similar sealer color with fact med blue metallic overspray or is the color just old fact oxide primer discolored over the yrs 0T02G139978