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Galvanized - Answer
The stick and MIG process both will not weld galvanized metal. Both of the processes do not allow for the successful expulsion of the vapors created by the zinc coating, thus causing what you describe as “pinholes” and we call porosity. I would recommend you use a gasless process flux cored wire, which has the ability to handle the zinc coating and float it to the surface of the molten weld metal, thus eliminating porosity.