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I use to go on quite a few road calls back in the day. With vehicles having the points ignition and running through standing water or just being a really rainy day, the inside of the distributor cap became saturated with moisture, rendering the system useless.
With the customers car being stranded along the side of the road, pouring down rain, I would remove the cap and spray the inside with WD40, washing out the moisture. Replace the cap and it would fire off. By the time you got back to the shop it would start missing and backfiring again.
One day I happened to have some CRC along and used it instead. Big difference in displacing the moisture and the car would make it back to the shop like nothing ever happened. That's one way how I found out that CRC was a better water displacement than WD40.
WD40 is very flammable and it dries out in only a few of days. We used to spray bare metal parts with it until they were ready for assembly but if the parts were stored too long you would find some rust. Just my experiences with it.
With the customers car being stranded along the side of the road, pouring down rain, I would remove the cap and spray the inside with WD40, washing out the moisture. Replace the cap and it would fire off. By the time you got back to the shop it would start missing and backfiring again.
One day I happened to have some CRC along and used it instead. Big difference in displacing the moisture and the car would make it back to the shop like nothing ever happened. That's one way how I found out that CRC was a better water displacement than WD40.
WD40 is very flammable and it dries out in only a few of days. We used to spray bare metal parts with it until they were ready for assembly but if the parts were stored too long you would find some rust. Just my experiences with it.