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Ted Mooney, P.E. RET
Pine Beach, NJ

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What is joncoat?

Hello, I have a question about black oxide. The print that I have calls for black oxide and joncoat, dry to touch, per GM 4347-M. Now I have a copy of GM 4347-M, and I know what black oxide is, but what is joncoat?

Colin Shiels
springs - Spring Grove, Illinois, USA
1999

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