Black Jack Roof Patch is an extra tough flexible repair compound designed to patch splits cracks and holes in roof surfaces. This water based patch dries quickly to a non-tacky surface which offers great adhesion to all coatings applied over it. It is designed to repair cracks and holes up to 1 inch width. Black Jack Roof Patch should be used with seam and repair fabric. Black Jack Roof Patch remains flexible while it expands and contracts with your repair making it ideal to use with all reflective roof products.