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

£28.80

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Solvent-based, brush-applied bituminous waterproofer for roofs. Ideal for mastic asphalt, felt, metal, and fibre cement surfaces. Delivers instant waterproofing and long-lasting protection—even in damp or cold conditions.

Size

5 Litre 22.5 Litre

Product variants

Delivery and Shipping

Place your order before 3pm for next working day delivery.

Please note: Additional delivery charges may apply for Northern Ireland, Isle of Wight, Isle of Man, Isles of Scilly, Scottish Highlands & Islands, and Channel Islands. We will contact you to inform you of any additional costs once your order is received, or you can call us on 0800 111 4898 beforehand to confirm.

Description

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

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