Material Safety Data Sheet Technical data sheets - Select a technical data sheet -P-U-49 Wet-on-wet filler, blackP-U-49 var sanding filler plasticsP-U-49 var wow plasticsP-U-49 var wow metal P-U-49 ProClass - undercoat solutions.Efficient filler - wet-on-wet application with basecoat. For efficient repair of new panels due to no sanding and no drying times.