Harlequins Stain Blocking primer is a unique water-based isolating paint which when applied to raw wood stops most brown/yellowing stains coming through onto your painted finish.
 
This unique product is ideal to be applied onto nicotine or water stained walls prior to painting or old wooden furniture that is going to be revamped or repainted, in fact any surface where staining could be a problem.
Simply apply with a brush according to instructions.