I read an article in Audio Amateur about potting circuits that the type of silicone that comes in caulking tubes is corrosive. According to this article, the vinegar smell comes from acetic acid. I'm no chemist, but I would find out before putting it on connectors. I guess it is no big deal on some 50 cent plugs, but I'd hate to ruin something expensive.
Short Out Plugs
I stumbled on this concept in one of my pre-amp manuals. The factory recommends I use SHORT OUT PLUGS in all my unused inputs. I've seen them for sale but $6.00 per pair seems a little steep. Can I make them myself? If so how?