refinishing a 870 express?

Unfortunately, oil has to get underneath the water if it's going to displace it.
Two inches or 2 molecules, it still has to get underneath it.

Some chemist here please explain the process.
 
I can put a complete pistol in my ultrasonic cleaner (or in the sink!) then shake it out/blot it off and spray thoroughly with WD 40.

Guess what? No rust! Inside or out!

Seems like the water was displaced.
 
So the best way to prevent in the future is:

1. never store in a case, esp soft case. Did I say NEVER.

2. Every time you handle(or anyone else) wipe the outside metallic parts w/ good coat of RIG (Rust Inhibiting Grease). Be esp sure to wipe off fingerprints, every time. If the gun(s) havent been used do it every 6 months
just for the fun of it.

No more rust.
Better to store in the corner of the closet than in a case, rust wise. Some will disagree, I understand.

WD 40 on a gun?? Why??
 
Mehavey said:
Unfortunately, oil has to get underneath the water if it's going to displace it.
Two inches or 2 molecules, it still has to get underneath it.
Click to expand...

You are testing the wrong displacement mechanism. So is FITASC's linked article's author. One mechanism involves displacing water from a puddle or container, while another displaces water from a metal surface. The puddle displacement can be done by any liquid denser than water because you are testing which liquid is more strongly pulled down by gravity. The other mechanism is displacing water from the surface of a piece of steel, where you are testing which liquid enjoys greater molecular attraction to the steel.

The latter mechanism is what is useful to a gun owner; not whether it floats or sinks in water. The way to test for water displacing of the latter sort is as follows:

Take a tuft of fine steel wool and soak it in a solvent until all the protective oil is gone from its surface. Let it dry. Tie a string around it so it may be suspended from a stick laid across the lip of your martini glass. Tie it to such a stick. Fill one glass with water and suspend the tuft in it until it soaks up the water. Fill another glass with the water displacing candidate. Move the water-soaked tuft (you can shake excess water off on the way over) to suspend it in the glass with the water displacing candidate and then wait a day. If the water comes out and settles in beads on the bottom of the glass, it has been displaced from the steel wool.

That latter type is the kind of displacing action the gun owner needs. Once it has been accomplished on something, I usually wash off the displacing oil with a rust-inhibiting oil like LPS-2 or apply Boeshield T9 or RIG to the surface for rust resistance, assuming that’s needed, or a 100% synthetic gun oil if I don't need rust resistance. I am, alas, another person who has seen WD-40 get tacky and found dust sticking to it after something coated with is has sat out for a year or two.

From the WD-40 web site's FAQ:
"Use WD-40 Specialist Dirt & Dust Resistant Dry Lube PTFE Spray when you need a lubricant that will keep things clean; its non-sticky formula won't attract dust or leave oily residue."​

I assume the fact they identified the need for such a product means they've noticed what I described can happen.
 
Take a tuft of fine steel wool and soak it in a solvent until all the protective oil is gone from its surface. Let it dry.
Tie a string around it so it may be suspended from a stick laid across the lip of your martini glass. Tie it to such a stick.
Fill one glass with water and suspend the tuft in it until it soaks up the water.

Fill another glass with the water displacing candidate. Move the water-soaked tuft (you can shake excess
water off on the way over) to suspend it in the glass with the water displacing candidate and then wait a day.
If the water comes out and settles in beads on the bottom of the glass, it has been displaced from the steel wool.
Click to expand...
You had me from the word Martini.
Gotta try it.
;)
 
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