Ultra Premium Acrylic Sealer Undercoat (Ultraseal®) is an ultra-premium quality water based undercoat suitable for interior and exterior applications. This product is ideal for broad wall applications making it perfect for sealing new plasterboard. Acrylic Sealer Undercoat (Ultraseal®) is fast drying and can be used under both water based and oil based paints. Acrylic Sealer Undercoat (Ultraseal®) Prepcoat Paint is Global GreenTag Certified.