Loctite is a brand of adhesives primarily used as a "threadlocker" to prevent nuts, bolts, and screws from vibrating loose. It also seals threads to prevent moisture and rust. The brand also produces everyday super glues, epoxies, and industrial bonding agents.The Main Types of Loctite ThreadlockersLoctite is applied in liquid form to the threads of a fastener before it is tightened. It hardens in the absence of air and comes in different strengths:Blue: Medium-strength. It is the most common type used in automotive and household projects. It holds fasteners securely but allows them to be removed later using standard hand tools.Red: High-strength. Used for heavy machinery or parts that should never vibrate loose. Because it creates a permanent bond, you typically need to apply heat (from a blowtorch)