Aerospace Sealants AS157 Gray RTV Silicone Adhesive Sealant - 2.8 Oz Tube, FAA-Approved Alternative to RTV157 Alternative to RTV157, approved by Federal Aviation Administration (FAA) Confirms to standards of MIL-A-46106 Type I Group II material Excellent quality for high strength applications Room temperature cure; Thixotropic paste Excellent unprimed adhesion to plastic, metal and glass