The Halton Expanding Foam Filler is a ready-to-use waterproof product perfect for filling in gaps and cracks in walls. This 2-pack comes with expanding foam cans that are specifically designed to be used with wood, ceramic, and metal materials. Weighing 500 grams each, these cans are easy to use and provide a reliable seal to keep out water and pests. The waterproof formula ensures long-lasting protection, making it a must-have for any DIY home improvement project. Ideal for walls, this expanding foam is a versatile and efficient solution for sealing and insulating various surfaces.