The Polyfilla X50 External Gap Sealant 410 g is a weather‑resistant sealant designed to fill and seal gaps on exterior surfaces where movement and moisture are concerns. It stays flexible after curing to reduce cracking and shrinkage, and it bonds strongly to timber, masonry, concrete, aluminium and more. Once dry, it can be painted to match surrounding surfaces.

Ideal for sealing expansion joints, door and window gaps, skirting boards and exterior trim before decorating or finishing.

Key Features

• Exterior‑grade gap sealant with flexibility to resist cracking

• Strong adhesion to timber, masonry, concrete, aluminium and more

• Weather‑resistant formula for outdoor use

• Paintable once dry for seamless finishes

• 410 g cartridge fits standard caulking guns