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what is this coating on metal ?

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04-02-2015, 10:45 AM	#1
blazer2007 Registered User Join Date: Jan 2007 Location: vernon b.c. Posts: 3,022	what is this coating on metal ? I noticed on some of the thinner sheet metal scraps I bought have a coating on them,what is it and should I remove it before paint.I,m wearing the proper mask for welding with zinc weld thru primer but still would like to know what I,m working with.You can see how it changes color after welding.Is the piece on the right Attached Images

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