Bostik Gap Seal

Bostik Gap Seal is a flexible, water-based acrylic gap filler designed for sealing and finishing gaps and cracks around the home or job site. Easy to apply and paintable, it provides a smooth, professional finish for both DIY and trade applications.

Key Features

• Flexible acrylic formulation – resists cracking and slumping
• Paintable with water- and oil-based paints once cured
• Excellent adhesion to plasterboard, timber, brick, concrete, and masonry
• Easy to apply and tool for a neat finish
• Water-based, low odour, and safe for interior use
• Cleans up with water before curing

Applications

• Filling gaps between walls, ceilings, and cornices
• Sealing around window and door frames
• Filling cracks in plasterboard, brickwork, and masonry
• General purpose interior gap filling before painting or finishing

Specifications

• Packaging: Standard cartridges (approx. 450g)
• Colour: White (paintable to match surface)
• Application method: Standard caulking gun
• Interior use only (not suitable for permanently wet or exterior areas)