CATEGORY 5 is an extremely flexible patch with outstanding adhesive properties. It is uniquely formulated to provide a permanent repair for cracks in a wide range of substrates without shiners. Substrates include - but not limited to: concrete blocks, bricks, hardboard, wood siding, stucco, tilt-up, and EIFS wall systems. Brush or knife grade available in smooth or textured finish. Available in gallon and 10.1 oz tube.