05/28/2026
Most parkerizing jobs fail before the gun ever hits the bath.
The surface prep is where it goes wrong. A polished or smooth surface will not parkerize correctly. The phosphate reaction needs a rough, blasted surface to bond to. Skip the aluminum oxide blast or polish after it, and the coating comes out thin, patchy, and useless.
What a correct job looks like:
Aluminum oxide blast to bare metal
Simple Green degreasing soak, not a wipe
Zinc phosphate bath held at 185 to 190°F
Brownells Water Displacing Oil post-treatment
We just finished an RIA Model 200 .38 Special for a client near Tracy, MN. Worn factory parkerizing, bound action, timing off. Mechanical work first, then a full parkerizing process start to finish.
The full breakdown of how it works, what goes wrong, and what the correct process looks like is on the blog.
https://www.redlegguns.com/post/how-to-parkerize-a-firearm-the-process-the-prep-and-what-goes-wrong
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