Tack Cloths are used to remove dust, lint, and other particles from sensitive surfaces. Will not dry out, harden or darken. Tack cloth leaves no residue. Non-toxic. Use before painting, staining, or varnishing to ensure a clean surface. Tack cloth is cheesecloth impregnated with varnish, which yields a slightly sticky, or tacky surface. Popular with commercial and residential painters and furniture and other wood refinishers.