Bonda Decor Fill is a 2 part multi-purpose polyester filler with rapid hardening properties for filling and repairing. Bonds strongly to wood, metal, concrete and GRP. Made from fine particle sized fillers, the surface when sanded is fine and dense.Bonda Decor Fill hardens with a non tack surface that is easy to sand and has minimal paper clogging. Takes all types of paints. Does not slump on application and is ideal for:GRP (Glass Reinforced Plastic) - Repairs cracks, fractures and holes in GRP. Use for skim coating GRP to obtain a smooth surface. Patterns - For the construction of models and prototypes where a rigid, easily sandable, material is required.Concrete - Fills cracks and holes. Can be used to bond and build up damaged areas.Wood - Filling holes, splits, shakes and damaged edges on joinery as a woodfiller. Repairing window and door frames.Metal - Filling dents and holes in cars and vehicle bodies. Smoothes out weld joints and rough metal surfaces. Fills sanding marks. Mending metal pipes/gutters. Securing bolts and screws.