Threadlocker works best on new hardware for several reasons. While you can apply threadlocker to older hardware, spend the extra money and get new hardware if the bolt or screw is on a vehicle or machine where failure of the bolt could cause an accident. Threadlocker works as well on older hardware as new, but older hardware may fail due to age, invisible metal fatigue and has a tendency to fail after so many hours of use.
Tools and Items You'll Need
- Soft, lint-free rags
- Fine sandpaper or steel wool
Step 1-Clean Old Hardware
Most old hardware is pitted and rusted - even microscopically. Depending on how rusted or old the hardware is, sand any obviously rusted parts. Using your steel wool wrap it around the bolt and twist to reach areas on the threads. Do the same with any nuts. Wipe clean and dry with rags.
Step 2-Examine Bolts
Look for any cracks, burrs or damaged threads. Discard and replace if necessary. Threadlocker will flow into any pits, holes or cracks and hold old bolts as well or better than new. The concern is the integrity of the metal bolt itself.
Step 3-Apply Threadlocker
Apply enough threadlocker to wet the entire area where the threads will engage.