Alcohols will not harden emulsions. They are mild surfactants, and the activity as a surfactant increases as the number of alcohol groups goes up on a molecule. Glycerine has 2 effects, one as a mild surfactant and another as a humectant. Sorbitol is another alcohol that can be used.
I have not been able to design an inexpensive carbon coater Sandy. Still thinking about it though.
I'll be at the Formulary from the 3rd - 8th teaching. I may be able to stay until you arrive.