Product Description

Bostik Penetration Primer for Roofs is a high-performance, low-viscosity bituminous primer designed to prepare and seal a wide range of roofing surfaces prior to the application of waterproofing systems. Ideal for both professional contractors and DIY use, it enhances adhesion and ensures long-lasting performance of subsequent coatings.
This easy-to-use primer penetrates deeply into porous and slightly damp substrates, helping to seal and stabilise surfaces such as concrete, cementitious screeds, roofing felt, mastic asphalt, slate, steel and corrugated iron. By improving surface condition, it creates an optimal base for bituminous adhesives, emulsions, solutions and flashing products.
Its thin consistency allows for smooth application by brush or spray, ensuring even coverage and efficient use across various projects. Once applied, it improves sealing properties and helps prevent moisture ingress, making it an essential step in roof preparation and maintenance.
Suitable for use on most common roof surfaces, Bostik Penetration Primer is particularly effective for refurbishment and repair work, helping to extend the life of roofing systems and improve overall durability.
Key Features:
Low viscosity for easy application
Excellent surface penetration
Suitable for slightly damp substrates
Improves adhesion of coatings
Enhances sealing properties
Apply before bituminous systems
Technical Specifications:
Product type: Bituminous primer
Brand: Bostik
Colour: Black
Application: Brush or spray
Suitable surfaces: Concrete, asphalt, felt, metal, slate
Use: Roof preparation and priming
Function: Surface sealing and adhesion promotion
Finish: Penetrative, bonding base coat