Sandable, Paintable and Waterproof. Easy to Sand, Paintable & Waterproof! J-B Weld Body Filler dries in 30 minutes! J-B Weld Body Filler can be sanded and painted after it dries in 30 minutes! J-B Weld Body Filler is stain-free so you can apply any paint to your repair surface and have no worries!