What is a Tack Cloth? (as known as a Tack Rag) In a nutshell, a tack rag is a sticky cotton rag that is used for wiping down panels that you plan to paint, varnish, or clear coat. They’re not only used for automotive painting but for any work relating to refinishing. WARNINGS & PRECAUTIONS You never want to ever wax and grease over freshly painted base coat paint or in between coats. Wax and grease remover is only done once immediately before a paint job. #basecoat #autobodypaint #autobodyrepair