For passive metals (stainless steel, zinc, anodized aluminum) or large gaps (>0.3mm), use an activator like Loctite 7471 or 7649. This speeds up cure time from 24 hours to 30 minutes.
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Use a solvent cleaner (acetone or Loctite 7063). Remove all oil, grease, and old threadlocker. The surface must be "water-break free" (where water forms a sheet, not droplets). lokfix p80
In the world of industrial machinery, a few thousandths of an inch can mean the difference between a rotor spinning true for a decade or a catastrophic bearing seizure within a month. For passive metals (stainless steel