Anybody used this stuff? I want to do some touch-up on some fairly sizable areas of pistol with a parkerized finish (utility piece - not a collectable).

I was wondering if the finish this product produces is closer to pakerizing or is it closer to a cold blue? I've never read much about this product, but I found it through a Google search for "touch up parkerizing". Any and all feedback appreciated...

First off, I don't know if the stuff you mention works or not. However, old style rust bluing is an iron oxide process which at several points in the process after boiling becomes black oxide. Parkerizing, on the other hand, is a phosphate finish. Parkerizing can come in multiple colors including a few greens which is the most common, but also different shades of grey, black and perhaps other colors I haven't seen or recognized as such.

If, as you say, your gun has large areas of finish to reclaim, I can't see how you'd get a good color match. Perhaps a green/black camo finish. Maybe I'd be unique enough to be attractive and tacticool.

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NRA Benefactor

Thanks for the reply. I agree the color probably won't match very well. I'm not worried about that - like I said, it is a utility piece. I just want to cover up the areas that are more or less in the white.

I also realize black oxide isn't the same as zinc or magnesium phosphate. I just came across this product in a search for how to touch up parkerizing so I wanted to see if anyone has had any experience with it.

One other intriguing suggestion I came across is to heat the piece of metal you're finishing in the oven and heat a small quantity of zinc or magnesium phosphate solution in a microwave and then "dab" it on the areas you want to finish using cotton balls (wearing heavy rubber gloves of course).

What I've found to touch up parkerizing is Brownell's Dicrophan T4.

This is a cold blue, but unlike other cold blues, T4 gives a true black color.
It seems to be more durable then other cold blues, and unlike most of them you can apply as many coats as you want without it starting to puddle.

I find that the black color blends better with parkerizing then the blue color cold blues.

The "trick" is to thoroughly degrease with something like Acetone that leaves no residue, then spray the area with 90% alcohol and warm the area with a hair dryer.
Denatured alcohol might be even better, but lacquer thinner still leaves a slight residue.
Warm with a hair dryer until the moisture in the metal evaporates, but don't over heat. Too much heat seems to be worse then none at all.