ISOFLEX High-Performance Liquid Rubber Waterproofing Roof Seal Black 2.1 Litre New 2.1 Litre sealed. The ISOFLEX High-Performance Liquid Rubber Waterproofing Roof Seal in Black is a top-quality solution for protecting roofs against water damage. With a capacity of 2.1 litres, this product is specifically designed for roof paint sealant applications. Manufactured by Isoflex, known for their reliable products, this liquid rubber seal provides excellent waterproofing properties, ensuring long-lasting protection for roofs in need of maintenance or repair. Ideal for various industrial and building projects, this product offers a high level of performance and durability in safeguarding roofs from the elements.