Cobra glazing medium makes the paint flow better. The added amount affects the degree of transparency. This technique - making colored transparent paint layers without a brush stroke - is referred to a glazing. Cobra glazing medium is very fat and may only be applied in the last few layers of a painting. The medium increases the degree of sheen and the durability of the paint film, but does not affect the drying time of the paint. Cobra glazing medium is based on vegetable oil. It can also be thinned with water.