Rustins Quick Dry Polyurethane Varnish Matt Clear is a water-based, non-yellowing polyurethane varnish that is tough and durable and will resist cracking, peeling and blistering. It can be used on bare wood, hardboard, MDF, and unsealed cork. 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. Key features include being low odour, non-toxic, resisting alcohol and boiling water, providing long-lasting wood protection, and withstanding cracking, peeling, and blistering.