I have searched and read several threads concerning the addition to wines to increase body and mouthfeel, but I am unable to come up with the amount of glycerine that you should add to a 5-gallon batch of wine.
However I did find this in one of Wade's posts where he was answering this question:
"Use Glycerine in your wine to give it more body. Glycerine increases the wine`s mouth-feel giving it a fuller, more pleasant texture. Glycerine also smoothes over some of the harsh characteristics that are prevalent in most younger wines. Glycerine is a natural by-product of fermentation. It is a colorless, odorless, viscous syrup that has little noticeable flavor except for a slight sweetness. That makes it perfect for taking any wine and turning it into a big, macho red. Glycerine can also be used in cordials to enhance their body.
DIRECTIONS: Before adding Glycerine, the wine should be clear and moved off of any sediment into a clean container and ready to bottle. Add the Glycerine directly to the wine. It is important that the wine be stirred thoroughly to evenly disperse the Glycerine."
If anyone can help us with the amounts usually added to a 5-galllon batch of wine, I too, would appreciate the guidance.