Cover Stain from Zinisser dries quickly and has great hiding power, providing outstanding stain killing and enamel undercoating performance. It seals stains of all kinds, ensuring topcoats are blemish-free. This versatile product can be used on both interior and exterior surfaces, sticking to all surfaces without the need for sanding. It effectively seals water, smoke, and nicotine stains, and is also our best exterior wood sealer, blocking cedar and redwood bleed. It's touch dry in 35 minutes and recoatable in 2 hours.