Apply before a bituminous coating
For all common roof surfaces
Spray or brush on
Penetration Primer 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, such as Brushable Waterproofer.
Penetration Primer should be well scrubbed in by brush or applied by spray, taking care to ensure the surface is dry and as dust-free as possible.
Drying time is approximately 3-6 hours depending on conditions. Make sure that the product has dried completely before over coating.