GoBoard Seam Fabric is specifically designed to reinforce the GoBoard line of products in tile backing applications. Application Instructions Install GoBoard with GoBoard Fasteners or GoBoard Washers per the installation instructions making sure to leave 1/8" gaps between all boards and transitions. Fill all joints with GoBoard Pro Sealant and spread excess sealant approximately 1.5" on either of joints. Cut GoBoard Seam Fabric to required lengths using a scissors or a utility knife. Continue on with 3 steps .Place strip of GoBoard Seam Fabric over wet GoBoard Pro Sealant. Using a clean putty knife, set seam fabric into sealant using gentle sweeping motion. The sealant should not pass through the fabric. Begin tiling.