I am fermenting about 400 lbs. in a 45 gallon plastic primary
fermentor then I have been adding Scott Lab MBR41 or MBR31 at the end
of alcoholic fermentation along with some Scott Lab Optimalo for
insurance. I lay a plastic garbage bag on top of the must and will
incorporate Tom's idea of a little spitz of metabisulphate on top of
the plastic. I will probably stir every couple of days and at 20Cel.
or 70Far. The ML should be complete in 2 weeks and I can press of add
50ppm of SO2 and now let the wine settle in my secondary.