Bostik All Weather Brush Bituminous Waterproofer – 5L / 22.5LBostik All Weather Brush Bituminous Waterproofer

Heavy-Duty, Solvent-Based Waterproofing for Roofs

Bostik All Weather Brush is a premium-grade, solvent-based bituminous waterproofer designed for application on all common roofing materials. It dries to form a tough, black protective coating that provides immediate resistance to water ingress. This formulation is ideal for use in conditions where rain or frost prevents the use of water-based emulsions.

Key Features & Benefits

• Instant Waterproofing: Provides protection upon application—ideal for emergency or cold-weather work
• Compatible with Most Roof Types: Apply to mastic asphalt, roofing felt, slates, lead, zinc, copper, fibre cement, and corrugated iron
• Brush-On Consistency: Heavy-grade compound allows easy, controlled application
• Weather Resistant: Withstands rain, frost, and UV exposure for long-lasting performance
• Forms Tough Black Film: Dries to a durable, water-resistant finish

Technical Specifications

• Colour: Black
• Form: Paste / thick liquid
• Specific Gravity: Approx. 1.0
• Composition: Filled bitumen solution with organic fibre content
• Coverage: Approx. 0.7 L/m² per coat; two coats for optimal results
• Drying Time: Typically 24 hours (depending on conditions)
• Application Temperature: +5 °C to +35 °C
• Service Temperature: –10 °C to +85 °C
• Shelf Life: Up to 24 months unopened

Application Instructions

1. Ensure the surface is sound, dry, and free from rust, dust, and contaminants
2. Prime porous or dusty surfaces with Bostik Penetration Primer
3. Stir well before use. Apply with a brush at 0.7 L/m² per coat, in at least two coats at right angles
4. Allow each coat to dry fully before recoating
5. For reinforcement, embed a fibre mesh between coats if required
6. Clean tools with white spirit immediately after use

Safety & Storage

• Store in a cool, dry place between +5 °C and +35 °C
• Keep upright and tightly sealed when not in use
• Wear protective gloves, clothing, and eye protection during use
• Refer to the product SDS for full handling and first aid information

Bostik All Weather Brush is the go-to solution for reliable bituminous roof protection where traditional emulsions are unsuitable. Its instant waterproofing action and robust finish make it ideal for professional roofing repair and protection year-round.