WD-40.......I’ve been working at an oil refinery for the past 22.5 years. We use every kind of penetrating oil, lubricating oil, rust protection products you could even imagine.
These next statements are personal observations and have nothing to do with the place where I work other than we use some of the products I mention. I compare WD-40 to Varsol with added lubricant, added rust inhibitors and perfume.
We use lots of it. Personally I have it at home. I find it to be a poor penetrating product while comparing it to many other products. The best penetrating product I have ever used is Kroil hands down. Kroil I would not consider to be a rust inhibitor.
As a rust inhibitor WD-40 in my experience is poor as it evaporates in a very short time. Fluid film is the best lubricating rust protectant I have used. Rust check original is an OK rust inhibitor that doesn’t evaporate but does dry eventually this is why you have to reapply every year to maintain warranty. I compare Rust check to Transformer oil (mineral) with perfume, colour, and likely some type of rust inhibitors added other the the obvious oil.
Again my statements above are just what my experiences have led me to surmise.
I use WD-40 every time I clean my shotguns I spray it inside the barrels, use a brass bore brush to loosen any lead or plastic residuals and then push wadded up paper towels. After the barrels are clean I then coat inside and out with a very fine layer of Rust check original. Wipe it on wipe it off and don’t put oil on a fine wooden stock PLEASE
A great experiment for folks would be to put some WD-40 in a clean white container and let it evaporate over time to see if it leaves a sticky residue. Remember this product is petroleum based so put it in a well ventilated area and away from sources of ignition. The goal of this experiment is to find out if we leave WD-40 on our triggers for an extended time will it gum up, become tacky and/or interfere with the trigger mechanism in any way?
We could/should also consider looking at all products we put on our triggers do they or will they dry, become tacky over time, cause adverse effects to our triggers?
It seems to me most all these type of petroleum products will dry and become tacky overtime if left to do so. I feel a good maintenance regime of properly cleaning and reapplying fresh product of our choices sparingly will prevent any adverse effects.
When applying remember LESS IS MORE!
There must be a millwright or a machinist on this site. Let’s hear from them.
Wayne