I learned how to use metal leaf by a sculpturist who used in his work.
I started using the metal on canvas as a base layer before painting. First i paint the canvas with a colour of my choice,then a layer of glue, finally the metal leaf is applied.
Presently most of my paintings has some metal leaf either in them. I find the metal adds a luster and depth to the final piece and it is very rewarding to work with.