GBX is a high-performance, STP hybrid polymer sealant and adhesive engineered for demanding construction, building, and maintenance applications. With an advanced neutral-cure formula, it delivers exceptional grab strength, long-lasting flexibility and durable sealing — in both interior and exterior environments.

Key Features:

• High modulus & permanently flexible: Maintains elasticity under movement and stress.
• Interior & exterior use: Fully weather-resistant for external applications and stable indoors.
• Non-shrinking & neutral cure: No shrinkage, no silicone or isocyanates, safe for sensitive substrates.
• Excellent adhesion: Bonds to stone, concrete, PVC, plastics, ceramics, metals, gypsum board and more — even on slightly moist surfaces.
• Can be overpainted: Compatible with water-based paints for a clean finish.
• Low odour & solvent-free: Suitable for indoor use, environmental and site-safe.
• Rapid curing & good workability: Suitable for wet-on-wet application; strong final strength and seal integrity. 

Typical Uses:

• Sealing and bonding natural stone, marble and ceramic tiles
• Bonding PVC, plastics, polycarbonate and polystyrene panels
• Fixing concrete, gypsum boards and masonry units
• General construction joints, internal & external sealing, paneling, cladding work
• Mirrors, metal trims, and mixed-material installations
• Maintenance, repair, and professional building work requiring durable flexible joints

• A universal, waterproof construction adhesive and sealant suitable for:

  • Stone
  • Concrete
  • Mirrors (see TDS)
  • Natural stone
  • Marble
  • Gypsum board
  • Polycarbonates
  • Polystyrene
  • PVC
  • Many plastics
  • Ceramics

Specifications:

• Colour: Anthracite (Grey), White, Black,Crystal Clear - Note: Please don't colour match from the nozzle
• Packaging: 310ml cartridge (standard caulking gun compatible) 
• Cure Mechanism: Neutral cure, STP hybrid polymer
• Compatibility: Bonds to stone, concrete, plastic, PVC, ceramics, metals, gypsum board, polycarbonates, polystyrene and more.

GBX is an all-round, professional-grade hybrid sealant and adhesive — perfect for builders and contractors needing a reliable, flexible seal or structural bond that lasts the long term.