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Will birchwood casey cold blue blacken alloy? If not what will?
I've just filed down an alloy torch mount so now need to blacken the shiny bit

Gun Blue will not work on aluminium alloys which is what I presume you mean? The original finish was probably anodising. Do-able with a home kit but, paintings probably easiest.

For items that don't need to look perfect but you want a long lasting finish I have used a thin coat of POR15 in the past with very good results. For ali I think you will need to prime it though.

Yes, its aluminium alloy.
I cant be arsed buying an anodizing kit but have cold blue in stock so I just wondered if it would work.
Looks like paint then.

I used the following spray to coat two sheets of galvanised steel to good effect:
https://www.amazon.co.uk/gp/aw/d/B000LD ... _pop_mb_pd

I used the sheets as a base to mount my press to the bench and placed the other sheet underneath the bench. The nuts I used were being screwed into the wood. The sheet fixed that issue and now it spreads the force evenly across the surface.

Back to the spray. Make sure that your surface is clean and degrease using a suitable chemical (methylated or white spirits will do the job) and spray on with short, controlled bursts. Leave it to dry for fifteen minutes and apply another coat. Repeat until you get desired coverage and thickness. Then leave for 24 hours to harden.

Gazza wrote:Will birchwood casey cold blue blacken alloy? If not what will?
I've just filed down an alloy torch mount so now need to blacken the shiny bit

Cerakote is the best way to get a good, hard-wearing finish.

I used the Birchwood Casey to touch up the side of a Mossberg receiver that had been marked by a scope turret in and out of a cabinet. It worked surprisingly well.

You can buy a blacking solution for aluminium and brass.

Search '370893617303' on ebay.

Mattnall wrote:You can buy a blacking solution for aluminium and brass.

Search '370893617303' on ebay.