Rustins Quick Dry Polyurethane Varnish is a water-based, non-yellowing polyurethane varnish. Tough and durable and will resist cracking, peeling and blistering. Can be used on bare wood, hardboard, MDF, and unsealed cork. For interior and exterior use. Low odour and non toxic. Effectively enhances the beauty of wood. This product is suitable for outdoor and indoor joinery in both hard and softwood, doors, windows, garden furniture and conservatories, and can also be used as a sealer for concrete.