Paint thinners reduce the viscosity of paint to prepare it for use with sprayers, to clean brushes and surfaces after painting, or to thin out paint that has become too thick. Paint removers are used to dissolve unwanted paint markings from surfaces. Paint cleaners prepare surfaces for painting as well as removing paint from brushes and surfaces that were coated incorrectly. Wax and tar removers remove sticky adhesives from metal, plastic and fiberglass. Wallpaper remover dissolves old adhesive so that wallpaper may be pulled or scraped off surfaces. Prep cleaners are applied before painting to remove splintered or flaking leftover paint that may impede the bond of the new coat.