Cover Stain is specially designed to meet the high performance demands of professional painters. This product has exceptional application properties and versatility of use. On interior surfaces it dries quickly and has great hiding power, providing effective stain killing and enamel undercoating performance. It is especially effective against nicotine and water stains. On exterior surfaces Cover Stain has a unique whole house formulation that delivers full penetration and flexibility on all surfaces, particularly dimensionally unstable wood siding and trim.