Hey folks, I have a Spyderco GB coming in a couple of days. I was wondering if anyone had tried cold bluing CPM M4. It's going to be one of my workhorse cutters, and I thought it might help it to withstand the elements to patina the blade a little. Around these parts, when they say the weather is going to clear up, it means the snow will be "clear up" to your chest.
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Gun blue on M4?
- Thread starter Akcir
- Start date
Curious as well! I've stripped the coating off 2 BM M4 blades and (not surprisingly) have found that plant saps literally corrode the M4 before I can get back to the shop to clean it off-- minutes. And it takes more than a couple passes at 3000-grit to get down thru it.
Bill DeShivs
Knifemaker / Craftsman / Service Provider
- Joined
- Jun 6, 2000
- Messages
- 12,646
Cold bluing offers no resistance to rust. In many cases it increases susceptibilty to rust.
If you are worried about rust, why did you take the coating off the blade? The factory has a much better method of coating application than can be done at home.
If you are worried about rust, why did you take the coating off the blade? The factory has a much better method of coating application than can be done at home.
The knife comes without a coating. BTW, it seems to help firearms a little.
Bill DeShivs
Knifemaker / Craftsman / Service Provider
- Joined
- Jun 6, 2000
- Messages
- 12,646
I have been dealing with cutlery, firearms, and finishes for 40 years. Cold bluing is not the same as hot bluing or rust bluing.
- Joined
- Jun 13, 2007
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- 7,743
Please tell me you stripped a Contego. Then tell me you have pics. I've been wanting to strip mine literally since the day I got it.
- Joined
- Oct 4, 2013
- Messages
- 19
My browning citori has blued barrels and its a PITA (albeit pretty to look at). i would not want that finish anywhere near a metal surface that's highly susceptible to wear and tear. if you were hell bent on using a gun treatment, go with a parkerized finish.
- Joined
- Jul 22, 2009
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- 11,409
IIRC, a parkerized finish is a PITA to clean up. I'm thinking an acid etch would be a good middle ground.
