Reduce friction to protect threads and ease installation. These threadlockers are often used on large fasteners, which can be prone to seizing. They begin to harden when you thread coated surfaces together, blocking exposure to air.

Primer (sold separately) cleans the surface and decreases the time to reach full strength. It is recommended when working with aluminum, stainless steel, and titanium; black-oxide finishes; and cadmium and zinc coatings.

High Locking Strength—Keep fasteners firmly in place in motors, pumps, and other applications subjected to heavy shock and vibration. Breaking the bond of these threadlockers requires a propane torch, heat gun, or induction heater. As a result, they shouldn't be used in setups that you disassemble often.

Thick Liquid—Fill larger gaps than thin liquids, so they're best for coarse or worn threads.