I attended a recent on line seminar where Tylose PSO 810001 was recommended for this application. A clip from the presentation says “Tylose PSO 810001 thickens ethanol/water mixtures of any ratio”
The suggested formulations was:
Ethanol / water / glycerine (final concentration of ethanol: approx. 80 % v/v) 1. Ethanol 95 % v/v: 80,00 g 2. Water : 16,00 g 3. Glyerin: 3,00 g 4. Tylose PSO 810001: 0,5 – 1 g (dependent on the required viscosity).