5066 Polyester Premium Finishing Putty is a Premium Polyester Finishing Putty is effortless to spread and self-levels to a smooth, easy-to-sand surface that is pinhole free – improving your cycle time. The advanced easy-powder formula increases the sanding window. #5066/#5067 provides excellent results for that invisible repair every time whether over body filler, sand scratches, pinholes, aged OEM topcoats, steel, aluminum, galvanized and other zinc-coated metals, fiberglass and a wide variety of other substrates.