Prep - Zinsser Cover Stain (5 ratings) 1 litre €21.95 Quantity: at €21.95 each Add To Basket When your furniture/wood needs a stain blocking primer then this is perfect for the job. Zinsser Cover Stain is an oil based primer, ideal for great adhesion when blocking out tannins and oils from your wood. Stir well and apply in thin coats with a brush or roller and don't overbrush. Once dry, the primer can be gently sanded for a smooth base to your paintwork. Zinsser Cover Stain is ideal for raw pine, red woods like mahogany and cherry. Use an old brush for application and clean with White Spirits when finished.