Rustins Professional Wood Filler White 250g is a two part filler designed for strong, long lasting repairs on all interior and exterior woodwork. It hardens within 30 minutes at ambient temperature, providing a tack free surface. This wood filler is easy to sand and readily accepts Rustins Wood Dyes, paints, and varnishes. Once fully hardened, it can be sanded, drilled, machined, and planed. It is particularly useful for repairing edges on joinery where high strength is required, and is also suitable for marine applications.