Matrix 203 Plastic Roof Cement is a general purpose, reinforced, fibrated adhesive used to adhere fiberglass and organic conventional built-up base, ply, and cap sheets. Heavy, "trowel grade" consistency makes this product ideal for flashing details and a variety of roofing and waterproofing repairs, such as moving joints and roof penetrations. This product is scientifically compounded with premium materials to enhance resistance to flow and increase durability.