Birchwood Casey Fast-Drying Fast-Acting Aluminum Black Metal Finish for Restoring Scratched and Marred Areas, Gun Cleaning

Highly effective. This is really intended for touch-up of scratches and dings, but I needed to blacken a piece of aluminum for a telescope part. I was unsure how dunking the piece in a bath would work. After an hour, it came out quite black.

Use this on some aluminum parts didn't want to anodize the aluminum and this really worked great just keep applying several cards to get to the desired darkness

Works great like it alot thanks

My issue is that I seem to have received a returned item when I paid for new. The seal on the bottle was compromised and there was hair under the cap. I suspect the first person used what he needed and returned the rest. I did peel off most of the Amazon label on the bottle since it was covering the instructions. Though it didn't work for my application, I tested it on a aluminum soda can and it does work. I can't fault the product for not working on something it wasn't designed for, so though I really couldn't give it five stars, less than four would be unfair. I was hoping it would work on the scratched lens cap shutter on a Sony RX100MIII. I took a chance, and it didn't work.

This aluminum black finish works exactly as advertised. It dries quickly and provides a deep, uniform black coating that looks professional. Perfect for restoring scratched metal surfaces and touch-ups. The application is straightforward and coverage is excellent. A must-have for anyone working with aluminum or metal projects!

Worked well with correcting black steel charging handle that I scuffed up. Nice matte finish,

Should be good product but the seal failed as new product

Not bad, it does not replace anodizing but realize that bare aluminum l only oxidizes on the exposed surface, it doesn’t break down like steel alloys that could rust. So, clean the piece well, dry, apply this liquid, repeat. You will get a nice black finish.