The major component in most finger moisteners is glycerin. Glycerin has this amazing ability to hold moisture. Moreover, it will also retain moisture on the surface that you apply it on. But pure glycerine is a runny liquid similar to water and does not have portability. Therefore, manufacturers need to add a few other components as well to attain a comfortable consistency. These vary from manufacturer to manufacturer and also from product to product. The most common additives used in moisteners are propylene glycol, stearic acid, and sodium bicarbonate.