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WD-40 users take note WD40 causes rust problems if used incorrectly. WD40 is a penatration liquid used to remove matter (lubricants and rust) to free something up. If you do not apply lubrication after using WD40 to get something to work again the rust problem will only get worse. We use fluid film (can be purchased at most parts houses) to lubricate anything we spray WD-40 on.
PS In most shops the cans of WD-40 you see sitting around are used to clean the grease off the mechanics hands.
People often mistake WD-40 for a lubricant since things work better right after being sprayed with that stuff. In reality you have just removed all the dirt, rust, grease or grime that was preventing operation and replaced it with a weak lubricant / pentrant. With all the protective barriers removed (except the WD40) the rust will often be worse the next time it occurs.
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