Zinsser's Cover Stain¨ is an interior / exterior primer, sealer, stain sealer and bond coat that dries for recoat in only two hours.On interior surfaces, Cover Stain¨ dries quickly and has great hiding power, providing outstanding stain killing and enamel undercoating performance. Stains of all kinds are permanently sealed so topcoats are blemish free.Cover Stain¨ is especially effective on nicotine and water stains. New wood trim can be primed, sanded and top coated the same day, saving time and money. On exterior surfaces, Cover Stain¨ has a unique formulation that delivers full penetration and flexibility on all surfaces, especially dimensionally unstable wood panelling and trim, where few oil-based primers can succeed. It resists cracking and peeling and is compatible with all decorative top coats.