This is the high temp acrylic insulation/material that is used as both the adhesive and grout on KK grills. It is elastomeric and is more flexible as it gets hotter.
Green Patch: the refractory patch material used to repair and maintain the refractory hot-face/ firebox.
Lip cracks from repetitive freeze-thaw cycles are best fixed with J-B Weld 8297 HighHeat 500 Degree Epoxy Putty - 2 oz
