The article below contains excellent technique for the study of epicuticular waxes.
ZLATKOVIĆ, B. et al. Epidermal structures and composition of epicuticular waxes of Sedum album sensu lato (Crassulaceae) in Balkan Peninsula. Plant Biosystems-An International Journal Dealing with all Aspects of Plant Biology, v. 151, n. 6, p. 974-984, 2017.