Hi, I seem to have a recurring issue with a 335 Artisan Gibson that I have. The parts are 'gold' color and or brass ( pickguard mount, some screws ). I don't paly the guitar very often and after a month or so in the case, a number of parts do develop a rust or greenish tinge. The green/blue dust is raised. I buff the parts ( screws and mount ) and get them cleaned up, but it returns. The strings also get rusty. I do clean the strings, I do use a moisture absorption bag ( the canvasy things with pellets in them ). Now I have just tried coating all the parts with an evaporative rust inhibitor that leaves some wax behind. Maybe the Gibson case is moisture prone? I do not have this on any other Gibson guitar case setup.
Brass is an alloy containing copper. That's where the green stuff comes from.
Easy fix. Head to your nearest home improvement store and score some brushing lacquer. Grab a small brush and put a coat on any exposed portions of the screws\brackets\whatever. It dries to a mil and stays put until you unscrew them
As far as the strings, you're in Florida, right? Google Jaco's account of what happened to his first upright bass and I believe you'll find your answer.
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