Isoflex High-Performance Liquid Rubber has an advanced formulation which forms a permanent flexible waterproof coating for roofs. It has 5 times greater flexibility than conventional bitumen coatings, providing extremely long-lasting protection. Its tough, durable coating will not crack, perish or peel and can be used on virtually all roofing surfaces. - Adheres to virtually all roofing surfaces. - 20 Year Performance with correct preparation and application. - Impervious to all weather conditions.- Forms a permanent flexible waterproof coating. Available in 3 Sizes.Colour: Black.4.25 Litre