Blackfriar Acrylic Primer Undercoat in white is a quick-drying, all-in-one primer and undercoat, suitable for use on interior and exterior bare wood, stone, dry plaster and cement. Blackfriar Quick Drying Acrylic Primer Undercoat Colour: White. Size: 500ml. Blackfriar Quick Drying Acrylic Primer Undercoat is ideal for use inside and outside the home. It dries quickly, so you can apply a second coat after just 4 hours, enabling you to finish the whole job in one day. It is suitable for bare woodwork, hardboard, masonry, dry plaster and cement. Application method: Brush or spray. Coverage: 14m/L/Coat Touch Dry: 1-2 hours Hard Dry: 3 days Recoatable: 4 hours Blackfriar A05B2001.