Bostik Flash band Primer S.V. is a solvent borne bitumen solution designed to prepare porous or dusty surfaces before application of Bostik Flash band, especially in damp or cold weather. It primes and seals brickwork, cement renderings, roof tiles, concrete, mineralised felt, timber, metal, rainwater pipes, gutters and corrugated sheeting. It’s fast drying, easy application makes it ideal for cold, damp conditions.