OB1 Brown Multi-Surface Construction Sealant & Adhesive
Versatile OB1 waterproof sealant for metal, plastic, wood & underwater use. VOC-free, food-safe, and weatherproof.
OB1® Brown Multi-Surface Construction Sealant & Adhesive is a versatile, waterproof silicone solution suitable for a wide range of construction and repair applications. Its unique hybrid polymer formulation provides an exceptional bond for metals (including lead), plastics (such as PVC and GRP), glass, mirror, polystyrene, fibreglass, and wood—even in wet or underwater conditions.
Key features include:
- Excellent Chemical Resistance
- Resists Fungal Growth
- Weather Resistant
- Food Safe (Conforms to ISEGA Standards)
- No Solvents or Isocyanates (Zero VOCs)
- Does Not Shrink
- Paintable
- Unique Flexibility (Elongates up to 350%)
- Works in Wet or Dry Conditions (Including saltwater)
Applications
- Aluminium & Wood Bonding: Maintains a strong bond from -40°C to +120°C, accommodating material expansion and contraction.
- Marine & Pool Sealant: Water-resistant, even in saltwater, making it ideal for underwater tile applications.
- Carbon Fibre & GRP Repair: Provides a durable, flexible bond resistant to vibration and movement.
- Plastic-to-Metal Adhesion: Solvent-free formula prevents surface damage while allowing flexibility.
- Solar Panel Installation: Unlike silicone mastics, it won’t shrink, crack, or degrade.
- Mirror Adhesive: No solvents or isocyanates means no degradation of mirror backing.
- Bathroom & Kitchen Use: Prevents bacterial and mould growth, making it safe for food zones.
- Roofing & Gutters: Effective for sealing lead flashings and repairing leaking gutters.
- Gardening Repairs: Repairs terracotta, ceramic, concrete, and pond ornaments—even underwater.
Free 24 Hour Delivery*
266 shoppers already locked free delivery today
Save on courier fees worth £6.99
- Metal-to-metal bonding (including aluminium and lead)
- Plastic and GRP construction
- Glass and mirror installations
- Underwater sealing (pools, marine applications)
- Material: Hybrid polymer silicone
- Colour: Brown
- Temperature Resistance: -40°C to +120°C
- Elongation: Up to 350%
- Chemical Resistance: Excellent
- Fungal Resistance: Yes
- Weatherproof: Yes
- VOC-Free: Zero VOCs
- Food Safe: ISEGA-compliant
- Application: Wet or dry surfaces, underwater compatible
- Paintable: Yes
- Weight: 522g
Always follow local regulations and product guidance.
Free standard delivery on UK mainland orders. Express delivery options and international shipping available at checkout.
We offer a 30-day money-back guarantee on most products. For faulty items, contact us within 14 days for a replacement or refund.
View Full Delivery & Returns PolicySecure Transactions
We take the utmost care with your payment and personal details. Our website employs advanced encryption technology, including Secure Sockets Layer (SSL), to protect your information during transmission. You can verify a secure connection by looking for 'https' and a locked padlock in your browser.
Cookie Policy
Cookies enhance your shopping experience by keeping track of your basket and remembering you when you return. We also use banner advertising based on your browsing history to present products of potential interest.
Security Warning
Beware of phishing scams! We will never ask for personal details via email. If such information is required, we'll request you to contact us by phone. If you receive an email requesting sensitive information, do not respond and let us know immediately.
