Old Masters Gel stain is a highly pigmented, oil-based stain designed to achieve intense colors on interior and exterior wood, fiberglass, primed metal and composition surfaces. Its thick formula allows easy application and superior color control, necessary to achieve a rich and uniform color on most surfaces in a single application. Gel stain is especially recommended for woods such as pine, birch, maple, poplar and cherry. Gel stain is excellent for vertical surfaces.