Sorry, I am slow answering, the internet didn't exist for me much this weekend. RC-212 bad experience, bought Chambourcin grapes from a different source one year. My (at the time) normal grape grower didn't get any Chambourcin grapes for some unknown reason. These came from over in Illinois, instead of from rocky, bad soil Missouri. I am guessing the grower didn't add, didn't need to add enough nutrients and the gapes were very low in YAN (maybe, who knows). I made the wine following my normal procedure and all was well, until the last two or three days of fermentation, when four rabid skunks with very bad intestinal issues invaded the wine. Almost dumped the entire 12 gallons. I added Reduless twice, which is the maximum, to try to get rid of the smell. It mostly went away, but never completely. In addition, I was never able to get MLF to kick off, so the wine was a bit tart. I also had another experience with RC-212 starting to give off bad odors, but much sooner and rescued it with nutrients.
Since those two times I have vowed to never use RC-212 and haven't ever had issues. I would really like to try some of the unable to produce H2S yeasts, but I haven't been able to find them in homewinemaking friendly sizes.