Originally Posted by CaptnJohn
WD 40 will attract and hold dust and dirt causing larger problems over time. Use graphite on all locks ~~ coach, vehicle, and home....
FWIW - CaptnJohn is correct, because WD40 is a solvent. Most people think WD40 is a lubricant, but in fact it is not. You can use it to loosen something, but you really have to use a lubricant after you have loosened it up to keep it that way.
Another use of WD40 is to disperse water - like in a wet connector. WD means W