Niteo Cyclo ULTRAWELD Instant Gasket Maker: Black RTV Silicone Adhesive Sealant, 3 fl oz, Case of 12 Oxygen sensor-safe; pressure resistant Forms instant leak proof gaskets on all engines Low volatile formula meets GM 9985443 spec Great adhesive and sealant for many materials like metal, glass plastic, wood rubber, fiberglass 100 percent silicone - no fillers added