The Permatex Hight Temperature Threadlocker is designed for heavy duty applications at high temperatures. It prevents shock, intense vibration and heat stress from causing bolts and press fits 3/8" to 1-1/2" to loosen. Suited to temperatures up to 450 °F, it requires heat and hand tools to remove. This bottle of red thread locker is ideal for use in automotive, industrial and marine applications. FleetPride is your First Click in Heavy Duty®.