AQUAFERM STAINBLOCK is an acrylic stain insulating primer for indoor and outdoor use. It is suitable for blocking stains on the walls such as nicotine, smoke, humidity spots, pencil or pen marks, lipstick, extracts from tropical wood, etc. It is applied to all surfaces that need an insulating coverage primer before applying plastic, acrylic, water-based varnishes or decorative paints. Seals the surface. High cover power. Ensures a smooth surface for premium finishes. Practically odourless during application. ATTENTION DUE TO ITS SPECIAL COMPOSITION, DO NOT COLOR.