Bostik OB1 Sealant & Adhesive Anthracite 290ml

Looking for a high-performance sealant that blends perfectly with modern anthracite finishes? The Bostik OB1 Sealant & Adhesive Anthracite 290ml is a professional-grade hybrid polymer adhesive designed for maximum strength, flexibility, and a clean, colour-matched finish across construction, roofing, and exterior applications.

Formulated with advanced hybrid technology, OB1 delivers exceptional bonding power on virtually any material, including aluminium, uPVC, concrete, wood, glass, stone and plastics—without the need for primers. It’s the ideal solution for anthracite window frames, doors, cladding, and roofing details, where both performance and appearance matter.

Unlike traditional silicones or mastics, this all-in-one sealant and adhesive replaces multiple products, working as a sealant, grab adhesive, and filler in one cartridge—saving time and reducing product costs on site.

Designed for real-world conditions, OB1 can be applied on wet surfaces and even underwater, allowing work to continue regardless of weather—perfect for UK roofing and external sealing jobs. It forms a permanently flexible, waterproof bond that resists UV, weathering, mould, and bacteria, ensuring long-term durability.

Its solvent-free formula guarantees no shrinkage, cracking, or brittleness, while maintaining a strong, elastic seal that absorbs movement and vibration—ideal for expansion joints and structural bonding.

Why Choose OB1 Anthracite?

• Perfect colour match for anthracite windows, doors & cladding
• Bonds virtually any material – no primer required
• Works in wet conditions & underwater
• Will not shrink, crack or go brittle
• Flexible, high-strength bond for movement joints
• UV, weather & chemical resistant
• Mould & bacteria resistant – ideal for exterior & sanitary use
• Paintable finish for seamless results

Ideal Applications

• Sealing anthracite window & door frames
• Roofing, flashing & gutter repairs
• Cladding, trims & façade bonding
• Bathrooms, kitchens & sanitary areas
• Expansion joints & structural sealing