An interesting topic here...Additives that rum industry for example uses to improve and "premiumize" products fast & cheap.
Quoting: "Glycerine is a very common additive in the liquor industry. Not bourbon obviously, ttb wouldn't allow that, but it's far from unusual. It add s body and the sweetness reduces the harshness of young spirits. Still Spirits sells little bottles of glycerine labeled "smoothing agent". I don't use it myself but if i don't see how it's very different from adding sugar to fruit flavored liqueurs, it does does the same thing and for the same reason."
This plus sugar, and wow - you've got one "SMOOTH" sweet lovely Hispanic-style super-premium rum to sip and praise. Add to it some essences to emphasize wanted flavours like vanilla, dark fruitiness, some E150 to make it dark, a label where you put the age you FEEL it resembles - and voila! You can sell 3yo rather highly rectified spirit kept in some kind of a cask as a "15yo super-premium rum"
