The first RIS I ever brewed, it never finished. I dropped in two other yeasts to push it a long, including champagne yeast and no dice. Decided it was done, primed and bottled it. Waited a few months, cracked one open and no gas, just sugary malt. Made a second RIS batch, put the new one on the yeast cake of an American Stout, and then poured every bottle of the previous RIS into the fermenter at high Krausen. It is the most amazing beer, everyone loves it and I am down to just a couple of bottles that are two years aged.