2-part, thixotropic, methacrylate adhesive system that forms resilient bonds and maintains its strength over a wide range of temperatures.LOCTITE AA H4500 is a gray, 2-part, thixotropic, methacrylate adhesive system that forms resilient bonds and maintains its strength over a wide range of temperatures. It is suitable on substrates such as steel, aluminum, stainless steel, epoxy-coated metal, SMC and plastics.