Encaustic

Encaustic has it's roots in 5th century BC and was originally practiced by Greek artists to paint portraits and decorate marble and terra cotta architectural elements.  Made popular in modern times by Jasper Johns, encaustic is a significant medium with staying power.  

Encaustic is a beeswax based paint that is kept molten on a heated palette.  It is applied to a surface and reheated to fuse the paint into a uniform enamel-like finish.  I find this medium perfect for creating the luminous skies in the paintings below.

The high durability of encaustic is due to the fact that beeswax is impervious to moisture.  Because of this, it will not deteriorate, yellow or darken over time.