PolyBrite 73 is a premium-grade white elastomeric mastic with StretchSpan Technology™ (SST). This technology makes this product extremely pliable. PolyBrite 73 cures to form a seamless flexible, waterproof membrane that will expand and contract with the movement of the roof surface. This product is designed for use at various flashing and detail conditions when installing Polyglass’ elastomeric roof coating systems. PolyBrite 73 offers excellent adhesion, flexibility, high tensile strength and resistance to ultra violet degradation.