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Walther P1 Aluminum Alloy Frame - How To Re-Blacken It?

Hello. I have a P1 frame that has most of the black (anodizing?) worn off of it. I've been trying to darken/blacken it with Birchwood Aluminum Black but not having any results. Would this be because the frame might not be a pure aluminum alloy? I've waited 24 hours since the first application, and just applied more of the Birchwood - but still no change. Thanks for any help or suggestions. Thanks, Dean
 
Don't you still need to thoroughly strip the part, like with a sandblaster or something ?
Aluminum oxide blast with an air eraser just to remove the loose and rough the surface. I wash the parts in acetone, hit it with the eraser and acetone wash again. The eraser is like $30 at harbor freight. It’s a tiny blaster like an air brush. No cabinet needed. Little jar of aluminum oxide came with mine.

 
This was a baby rock 380 I did. Parkerized finish was crap out of the box. Before pics next to the RiIA BBR.
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After the acetone wash


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Finished product when I sold it, after several hundred rounds were put through it.
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The only place it ever wore was where the slide and the frame touch. Friction wear.
 

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Aluminum oxide blast with an air eraser just to remove the loose and rough the surface. I wash the parts in acetone, hit it with the eraser and acetone wash again. The eraser is like $30 at harbor freight. It’s a tiny blaster like an air brush. No cabinet needed. Little jar of aluminum oxide came with mine.

That's pretty cool.
 
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