Bostik Penetration Primer for Roofs is a highly penetrative, thin bituminous solution used for priming concrete roofs, cementitious screeds, renders, bitumen felt and mastic asphalt prior to the application of bituminous materials. Bostik Penetration Primer for roofs should be well scrubbed in by brush or applied by spray, ensuring that the surface is dry and dust-free.

Brand Name	Bostik