The thinned transesterified product yields a paint dry-to-touch overnight. Film formation is seen in two days at 20 deg C.
Residual glycerol aids brush flow and some di-glyceride serves as a non-ionic surfactant.
For use as a fuel, the biodiesel must be washed and dried. For paint formulation, I tap off the lower glycerol layer and use the top layer directly with pigment mulling.