Shellac is a very widely used single-component resin varnish that is alcohol-soluble. The wrapping itself is often sealed with Duco or clear nail varnish (polish). Within two years, phenolic resin was applied to plywood as a coating varnish. Thus, waxes and resins are re-dissoluble whereas a cured oil varnish or paint is not. Finally, a new coating of clear protective varnish was applied. Layers of varnish and glue had been applied to many areas. Colalucci states that Mazzuoli also applied a great deal of glue varnish. Some products are marketed as a combination of stain and varnish. Pills can be coated with sugar, varnish, or wax to disguise the taste. The work is protected with a coat of spray varnish. Teak is durable even when not treated with oil or varnish. The varnish is hardened using UV light. This is corrected with a special matte varnish. Topical fluoride is used in toothpaste, mouthwash and fluoride varnish. Fluoride toothpaste or dental varnish may aid remineralization.