Polycell Trade Stain Block in a 1-liter tin is a high-performance, quick-drying primer formulated to permanently cover and seal common household stains. This trade-strength solution ensures that stains such as water damage, nicotine, crayon, soot, and marker pen do not bleed through subsequent coats of emulsion or paint. It provides an excellent, opaque barrier that prepares the surface for a flawless topcoat. Ideal for professional decorators, this quick-drying formula saves significant time on projects, delivering reliable results on both interior and exterior surfaces.