Would it be good for coating the bare aluminum after milling an 80% lower?

I wouldn't use it. I use a heat black paint (like you would repaint a BBQ grill) heat the receiver spray at least 6 coats heating slightly between the coats then let set a week. Saturate in Brake Free CLP let set for 1 month then you have a factory coat that resist scratches. I use this method for all AK-47 metal parts as well. Just remember to use Brake Parts Cleaner on the metal before painting to clean any oil even fingerprints off the bare metal.

Can this be used to touch up black anodized aluminum? Will it harm the surrounding anodized areas?

Yes! I used this to touch up a black anodized Vortex riflescope. The results are the scope looks brand new! Make sure to clean surface thoroughly first. I used an alcohol swab, then dry wipe with paper towel, then paper towel with a bit of dawn to degrease, then dry paper towel. I then used a large cotton swab to apply. I held it on for 30 seconds at a time with one minute breaks in between, for no more than 5 total times per scuff. Good luck!

Will this darken gold anodized aluminum??

Has to be clean, bare aluminum.

Will this only oxidize bare aluminum? Stone washed purple knife scales and want to darken up the bare (silver) aluminum coming through.

I used this to try and touch up a bare spot on a mossberg 500 shotgun. It actually etched the bare areas, and stripped off part of the remaining bluing(black). BUT after contacting mossberg I was told that their allow, and finish is not compatable with aluminum black. In short I cannot answer you're question except to say call the maker for a hint first..

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Description

🖤 Restore. Refine. Rule your gear with Birchwood Casey’s fast black metal finish.

TRUSTED LEGACY - Since 1948, the go-to choice for serious shooters and collectors demanding quality and precision.
VERSATILE FINISH - Transforms aluminum parts, plaques, trophies, and nameplates with a sleek, professional black finish.
CUSTOMIZABLE LOOK - Finish ranges from deep gray to black depending on alloy, enhanced further with clear coat, wax, or oil.
EFFORTLESS APPLICATION - Easy-to-use liquid that glides on smoothly, perfect for gunsmiths and pros alike.
RAPID RESTORATION POWER - Fix scratches and marred aluminum surfaces in minutes with a fast-drying, no-dimensions-change formula.

Birchwood Casey’s Fast-Drying Aluminum Black Metal Finish is a professional-grade liquid solution designed to restore scratched and marred aluminum surfaces quickly at room temperature. Trusted by gunsmiths and shooting enthusiasts since 1948, it delivers a durable black finish that varies from deep gray to black depending on the alloy, ideal for gun parts, plaques, trophies, and engraved items.

Specifications

Brand	Birchwood Casey
Color	Black
Finish Type	Brushed
Size	3 Fl Oz (Pack of 1)
Item Volume	90 Milliliters
Special Feature	Works on aluminum and Sandium
Unit Count	3.0 Fluid Ounces
Paint Type	Oil
Specific Uses For Product	Aluminum surfaces, name plates, plaques, trophies, and other engraved items
Surface Recommendation	Aluminum
Item Form	Liquid
Included Components	see descritption
Is Waterproof	False
Model Name	Fast-Drying Fast-Acting Aluminum Black Metal Finish for Restoring Scratched and Marred Areas
Package Information	Bottle
Color Code	#333333
Water Resistance Level	Not Water Resistant
UPC	029057151251
Global Trade Identification Number	00029057151251
Manufacturer	Birchwood Casey
Item Package Dimensions L x W x H	7.4 x 3.7 x 1.42 inches
Package Weight	0.12 Kilograms
Item Dimensions LxWxH	7.5 x 3.75 x 1.5 inches
Item Weight	85 Grams
Brand Name	Birchwood Casey
Warranty Description	See manufacturer
Material	Aluminum
Suggested Users	unisex-adult
Number of Items	1
Part Number	BC-15125
Model Year	2015
Style	3 FLOZ BOTTLE
Sport Type	Shooting

Reviews

P**H

Good product

Works great. Good price

22.09.2025

R**E

Resurfaced SIG p320 slide.

Obtained scratches and rub off on my sig p320 slide, just below the front sight. Followed the instructions to the tee with this product. The results were awesome. My p320 slide looks as good as new. Will see how the test of time pans out. Right now, highly recommend.

22.08.2025

T**Y

Great product

Works awesome plus keep my Pew Pews looking good from scratches

6.09.2025

G**S

Good for zinc came

Works well on zinc for stained glass.There's a good YouTube video out there for application tips.

4.06.2025

G**C

It works!

There were some scratches on my AR15, so I used this product to cover them and it works. Just follow the instructions. I totally recommend it for scratches on your guns.

31.07.2025

L**S

Good pricing.

Works as advertised.

20.08.2025

2**A

Not for me.

Works ok, I still had a few scratches that it did not work on. Maybe I was just not doing it correctly.

25.09.2025

L**E

Fixed an ugly gun.

Trigger guard on my . 22mag predator calling rifle is an ugly aluminum/silver color after the factory paint wore off. This turned it black in no time. Super Product, Easy to use. Very Happy.

1.09.2025

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