Product description
Bostik OB1 Sealant & Adhesive Black 290ml
Need a sealant that sticks first time, every time—even in tough conditions? The Bostik OB1 Sealant & Adhesive Black 290ml is a premium hybrid polymer adhesive designed for maximum strength, flexibility, and long-term durability across roofing, construction, and general building applications.
Unlike traditional silicones or mastics, OB1 delivers extreme bonding power on virtually any material, including metal, wood, concrete, glass, PVC, GRP, stone and more—making it one of the most versatile sealant adhesives available.
This all-in-one solution replaces multiple products, working as a sealant, adhesive, filler, and grab adhesive, helping tradespeople save time while achieving professional results on site.
What makes OB1 stand out is its ability to perform in real-world UK conditions. It can be applied on wet surfaces and even underwater, allowing work to continue regardless of weather—ideal for roofing repairs, external sealing, and emergency jobs.
Its solvent-free hybrid formula ensures no shrinkage, cracking, or brittleness, while maintaining a strong, flexible bond that absorbs movement and vibration over time.
Engineered for durability, OB1 is fully waterproof, UV resistant, and temperature resistant from -40°C to +120°C, ensuring long-lasting performance in even the harshest environments.
Why Bostik OB1 Outperforms Standard Sealants
- Bonds virtually any material – no primer required
- Works on wet surfaces & underwater – perfect for UK weather
- Will not shrink, crack or become brittle
- Flexible, high-strength bond for movement joints
- Waterproof, weatherproof & UV resistant
- Mould, mildew & bacteria resistant
- Paintable finish for a clean, professional look
Ideal Applications
- Roofing, flashing, and gutter sealing
- Bathrooms, kitchens & sanitary sealing
- Bonding panels, trims, mirrors & fixtures
- Expansion joints & structural bonding
- Automotive, marine & industrial use