There are the two skin options for fiberglass doors, Smooth and Textured. The most popular option is smooth as most people paint their doors, and a textured option allows one to stain the door. Textured can also be painted, however a textured skin usually costs more. With textured skins, there are multiple grain styles such as Fir, Mahogany, and Oak, and gel stain kits are usually available from the manufacturer.