Gamblin Cold Wax Medium can be used to make oil colors thicker and more matte. A soft paste formulated to knife consistency it is made from naturally white unbleached beeswax, alkyd resin and Gamsol. Gamblin Cold Wax Medium contains no oil so it can be applied as a wax varnish over a dry oil painting or mixed with Gamsol to increase stiffness when added to oil paints. Add no more than 1/3rd total paint volume otherwise cracking may occur.