Fleetwood Water-Based Pure Grip Primer White 5LFleetwood Pure Grip is an all purpose water based undercoat and primer that can be used on all interior and exterior surfaces . Covers and permanently blocks oil based stains, graffiti, grease spots, tar, asphalt, blocks previous colours and even dark colours. Stick to all surfaces without sanding, old based paints, clear finishes, formica and even glass. Seals porous surfaces, drywall, wood, plaster, concrete, masonry & brick, exterior surfaces,