Merkrete Pro Patch Plus is ideal for achieving flat surfaces, during the surface preparation process. Merkrete Fracture Guard FD prevents existing or eventual substrate cracks from transmitting through to the GPTP/S surface. Merkrete 820 Dustless Merlite and 855 Dustless XXL dustless mortars are formulated to accommodate the needed bond strengths and application times associated with GPTP/S installations. High-performance Merkrete ProGrout Plus delivers hard, durable joints while MK-100SC 100% Silicone Caulk yields expansion joints strong enough for GPTP/S installations.