I have an ugly spot on my passenger side door and I am finally getting the door repainted (yea!). I have a solid gray truck and the painter wanted my paint codes, but the tag in my glove compartment lists both a "PRIMARY PAINT" (PSB) and a "Secondary Paint" (QSB). What could the secondary color possibly be since I have a single-color vehicle? Is it the black on the bumpers? Is it the type of clear coat? It wouldn't be the interior color since this label clearly says "paint" and the factory doesn't paint the interior pieces. I checked the VIN on the sticker and it is the VIN of my vehicle.