This Ronseal Big Hole Smooth Finish Filler in White can fix holes up to 50mm deep in one go. It dries in 1-2 hours with no sagging and once dried, it can be drilled, screwed, and nailed into. It is a next-generation lightweight filler based on acrylic polymer and hollow ceramic microspheres, providing a smoother repair for big, deep, and large gaps or holes.