R & F - Encaustic - Gesso - 4 ounce - R and F Encaustic Gesso is a waterbased, non-toxic ground for encaustic painting. R and F Encaustic Gesso is non-yellowing, flexible, non-cracking and sandable to a smooth, clean, absorbent surface. It cleans up easily with soap and water. If you are looking for a quick and easy way to create a white ground for encaustic painting we have great news for you! R and F has produced a ready to use white ground for encaustic painting. This is a modern version of the traditional, but painstakingly laborious, rabbit skin glue/chalk gesso. It is also an alternative to the time-consuming mounting of paper on panel.