WD-40 is a water displacement fluid. Not a lubricant nor a solvent. It does have a few properties that are beneficial, such as flooding a duck or upland gun that has been in the rain to remove water, but overall it has no place in guns as a lubricant.
Synthetic lube like Mobil 1 and a light coating of wheel bearing grease on sliding parts, has been proven to be the most effective in several study's and by folks in the field that shoot thousands of round a week.
Couple problems with his testing.
1. A solvent is a solvent and an oil is a lubricant.
He complains about some products damaging the styrofoam.
Well I want my solvent to clean my barrel not lubricate it. That means getting the plastic wad fouling out of my shotgun barrel which take a product that will eat plastic. I want a product to remove copper and lead fouling and I'm sure most of those will also eat plastic.
2. A good solvent is not a lubricant and was never intended as such.
I have 2 products on the shelf a solvent and a lubricant and they don't interchange.
For everything else I use WD-40 and am going to change to WD-40 Specialist if it works as good as he says.
Noted:
Thanks for posting Grindstone.
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