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Best way to mask off parts while bluing steel

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
May 21, 2010

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First of two simultaneous responses --

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
May 26, 2010

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Second of two simultaneous responses --

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
May 27, 2010