870 Express. Had it with barrel rust. Will this work?

[TexasFats]

For many years, my go-to product for rust prevention has been RIG, now available from Birchwood Casey, IIRC. Two things, both related to the fact that it is a grease and not a liquid: First, it can be difficult to get it into some tight places. Second, it is really easy to get too much on. The lightest, thinest coat that will cover is more than enough. By the way, treat the gun a few times with it, or use a dab on 4-0 steel wool, rubbed lightly over the surface will remove rust quite well. Just remember, nothing will fill in pits caused by rust.

 

[jhenry]

I have the same shotgun, and use it fairly frequently. Won it in a raffle for 10 bucks. I did the happy dance. I use Corrosion X on it and have had zero issues. The stuff flat works and works well.

Mine came with a slug barrel and a ribbed field barrel with screw in choke tubes. I picked up a slightly blue worn 18" cylinder bore tube at the local pushers place for 50 bucks. I am going to have it bead blasted and blued and threaded for tubes. I prefer a tighter pattern than a cylinder bore throws for OO buck.

 

[shortwave]

spray with automotive zinc chromate primer and top coat with any good paint - Rustoleum, Krylon, automotive spray paint.

+1 Virginian-in-LA

If you are going to paint, remove all rust, wipe down with Prep-Sol or alcohol and use a primer before painting.

If your not going to paint, remove all rust and put several coats of wax on bbl.
You may also want to try Remington 'Dry Lube' with Teflon. I've been using it on the outside of my old,well worn single shot turkey gun for the last 2-3 years. Years of dragging it through the hills took its toll on the blueing and surface rust was always a problem. I used very fine steel wool and ATF on the whole bbl. to remove the rust. Wiped down with alcohol then sprayed a couple coats of dry-lube.
Recoat drylube after outings.
I've threatened to paint it in camo colors for years but have just never got around to it.