Illegality. I considered this for a bit when I was gonna need a lot of denatured alcohol for shellac.I've been using a lot of various solvents for degreasing and cleaning parts prior to painting.
Started to wonder, how difficult would it be to just set up a perpetual still and get it to pump out alcohol of a good enough quality to degrease stuff without leaving residue?
I wouldn't be drinking it, so I wouldn't necessarily care about methanol V ethanol, unless there's another reason to avoid that stuff?