Valco Cincinnati 71283 Hylomar Blue Gasket Marker and Thread Sealant Tube with Nozzle - 100 Grams The leading non-setting gasket and sealing compound in use worldwide. Used by the world's major automotive manufacturers and several Formula 1 teams. Non-hardening and non-setting, vibration resistant, seals surface imperfections and withstands rapid variations in temperature. Allows metal-to-metal contact and is resistant to combustion products, water, engine coolant, petroleum, lubricating oils, kerosene and fluorocarbon refrigerants. Used for dressing gaskets, threads and sealing gaps up to .25mm.