Originally Posted by baker3
So today I was told to spray my under carriage with WD40 to deter moisture build up and prevent rust. Good or bad idea?
Bad idea even for a temp fix. WD is a solvent. Will break up rust and repel moisture but when it dries out it can be even worse than before. PB Blaster lubricant is cheaper and will hang on longer without evaporation. New or used gear oil are also good temp fix until you have time to do it right (POR15 or equivalent). PB lube is cheaper too.