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Best way to mask off parts while bluing steel

May 21, 2010

I am planning on bluing some parts of a steel helmet and need to know the best way to mask off the parts I don't want blued. Any suggestions?

Joe Chao
hobbyist - Miami, Florida

First of two simultaneous responses -- May 26, 2010

I do that all the time. De-grease the part and mask off the area not to be blued with heavy electrical tape. Will not harm the blueing bath either. Don't use it in high temperature potassium baths. I have taken it up to 320 F with no problems. Scotch makes some 10 mill stuff but I imagine all of the manufacturers do.

Rod Henrickson
gunsmith - Edmonton, Alberta, Canada

Second of two simultaneous responses -- May 27, 2010

Heat bluing or with chemicals?If heat try water and chalk or water and clay mix,I think it must work(try it on some scrap iron).If chemically try asphaltum solution or commercial etching ground.Hope it helps and good luck!

Goran Budija
- Cerovski vrh Croatia

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