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A popular myth has grown around the use of WD-40 as a joint lubricant and pain reliever for arthritis. The liquid is sprayed on the painful joint much as one would fix a squeaky mechanical hinge.
When used on a garage door, WD-40 will strip the oil from metal components, therefore removing any lubrication. You now end up with metal on metal with no lubricating oil to reduce friction and quiet down the door. This is why the garage door will actually get louder over time after applying WD-40 to all moving parts.