Big Boy Multi-Purpose Expanding Foam 500ml – Gap Filler, Insulator & Sealant | Easy to Cut, Sand & Paint

Big Boy Multi-Purpose Expanding Foam 500ml is a high-performance polyurethane foam ideal for filling gaps, cracks, cavities, and voids in walls, floors, roofs, and around windows and doors. It expands on application to seal out air, moisture, dust, and pests.

This versatile foam is suitable for both internal and external use and is compatible with most common building materials including brick, concrete, timber, and metal. Once cured, it can be easily trimmed, sanded, plastered, or painted over, providing a clean and professional finish.

Perfect for DIYers, builders, decorators, and mechanics — Big Boy Expanding Foam won’t shrink or crack over time and delivers long-lasting insulation and structural stability.

Now available at ProParts Direct with fast UK delivery and trade pricing.