Bostik Penetration Primer 5L

The Bostik Penetration Primer 5L is a highly penetrative, solvent-based bituminous primer designed to seal and prepare porous surfaces before the application of waterproofing systems. It is formulated to improve adhesion and create a strong bonding key for subsequent bituminous coatings, helping ensure long-lasting waterproof protection. Suitable for use on a wide range of substrates including concrete, cementitious screeds and renders, roofing felt, mastic asphalt, and metal surfaces, it is commonly used in roofing and waterproofing applications. Its low-viscosity formulation allows deep penetration into porous materials, even slightly damp surfaces, making it highly effective for surface preparation in demanding conditions.

• 5L solvent-based bituminous penetration primer
• Highly penetrative formula for deep surface sealing
• Improves adhesion of bituminous coatings and waterproof systems
• Suitable for concrete, screeds, renders, roofing felt, and metal
• Can be applied to slightly damp surfaces
• Low-viscosity formulation for effective absorption
• Ideal for roofing and general waterproofing preparation work