D DNA genetics amsterdam Active Member Sep 30, 2013 #1 Will 91 percent ISO be good enough to winterize?
Guzias1 Well-Known Member Sep 30, 2013 #2 https://www.rollitup.org/concentrates-extracts/723466-winterizing-bho.html
WarMachine Well-Known Member Sep 30, 2013 #3 it'll work decent enough I believe but 99% ISO or Everclear would be better.
Fadedawg Well-Known Member Oct 1, 2013 #4 Iso doesn't work as well as ethanol and 91% doesn't work as well as 99%.