Glycerine is used for liquids to to give it that thicker look and also to Carry them in the water. As its thicker than water its solubility is delayed if you dip your baits into it and cast out, letting you get your bait to the bottom of the lake. Due to the way glycerine interacts with water molecules by effectively covering with a coat it acts like a mild preservative although in itself it is not a preservative. It is also carry flavours well and baits soaked in it will harden, great for making hookbaits tougher.
Sold in 1 litre jerry cans