Permatex® Threadlockers fixture in approximately 20 minutes and are fully cured within 24 hours. Permatex® Surface Prep™ activator reduces fixture time to 5 minutes. Preceding values are for 3/8"–16 steel "as received" nuts and bolts at 72degF (22degC). Common applications: cylinder block and rocker arm studs, shock absorber mounts and ring gear bolts. For Use in Heavy Duty Applications Ideal for 3/8" to 1" Fasteners (10 to 25mm) Heat and Special Tools Needed for Disassembly Locks Studs, Bushings & Fasteners Against Vibration Loosening