Here is a helpful video giving you a quick rough how to on solder grinding fluxing zinc.
How to solder zinc sheet metal.
Looking to use a stainless steel perforated sheet metal for a hip vent on a copper standing seam roof.
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This how to video details the method of touch up and repair using zinc based solder.
Here is a helpful video giving you a quick rough how to on solder grinding fluxing zinc.
Learn the basics of soldering two pieces of metal together.
What flux should be used.