View Full Version : Parkerized finish with surface rust

October 27, 2012, 05:00 PM
I just picked up my NIB Mossberg 590A1 at the store. It was a special order. I took the barrel out when I got home and noticed a little surface rust on the top of the barrel. This is the first gun in have ever owned with a Parkerized finish. What is the best way to remove the rust? I have got it soaking in break free CLP right now.

October 27, 2012, 06:37 PM
The "rust" may be factory preservative which is often a rusty looking grease.

Let soak for a day or two, apply more CLP then GENTLY scrub with a brass "toothbrush" to remove the loosened rust.

Wipe dry, then apply more CLP as a protective coating and to continue to "work" on any remaining rust.
Parkerizing is very rust resistant, but far more so if you keep a thin coat of CLP on the metal at all times.

I keep a clean nylon toothbrush handy. After using or handling the gun I apply a few drops of CLP to the brush and scrub the metal, which helps remove any rust or dirt and refreshes the layer.
After use I rinse the toothbrush in a solvent to clean it, then apply more CLP.
If the toothbrush is solvent proof, you can rinse in lacquer thinner or paint thinner to clean it.

October 27, 2012, 07:18 PM
GOOD advice!

October 27, 2012, 07:30 PM
Dfaris gives good advice, but if it was me I would first scrub what looks like rust with the nylon tooth brush before going to the brass brush.

October 27, 2012, 10:29 PM
I will give it a good clp bath y'all. Wow Parkerized finishes drink oil! Thanks for all the help.

October 28, 2012, 12:26 AM
Are you sure it is parkerized? I don't think it is.

Personally, I would have taken it back to the store ASAP. The finish on that spot is ruined.

October 28, 2012, 02:29 AM
Per the Mossberg web site, the "barrel finish" of a 590A1 that is either "Marinecote" or "Parkerized".

October 28, 2012, 08:58 AM
Just an added thought, justice brothers makes jb80, put it on a soft cloth and keep rubbing. A buddy of mine used it to bring back a m-12 riot gun that was nothing but rust. Took some time but you wouldn't believe it was the same gun.

October 28, 2012, 02:27 PM
If it is indeed rust try using a ChoreBoy Copper Pad and a little oil (CLP, G96, etc) and it will take it right off without hurting the finish.

I've had good results with the ChoreBoy but make sure it's the copper one only.


October 31, 2012, 01:02 PM
I ended up using some 0000 steel wool on the spots (they were pretty small) that was soaked in CLP. I let the barrel drink in CLP for two days prior and then worked on the spots very gently. It came loose easily and the finish didn't change color or lighten at all. Looks like new.

October 31, 2012, 06:25 PM
Most Parkerizing is a zinc phosphate process. It is designed to hold oil. it is not especially corrosion resistant on its own.

November 2, 2012, 01:22 PM
steel wool... oh my.

I have never had problems using steel wool because someone told me early on not to.
Brass wool is expensive though.