Re: breaking through when sanding copper.
First thing is Are you sure the part isn't stainless ?
Secondly I think you have a cleaning problem and maybe haven't mastered the waterbreak test. Here's what I suggest. Got to the food mart and buy a ceramic stovetop cleaner (I use Ceramabryte). Use this to clean the part after sanding or buffing. Nothing gets you a faster water break test then this type of cleaner. It contains citric acid (that's right lemon) and guess what it activates your copper and iron based metals. You can forget the pickle it is no longer needed and you'll never get bubbles again (aluminum is an exception).
|