Ranger-Dina Wakley Media Glazing Medium Jar. Glaze Medium is a fluid, multi-functional medium that can be used to extend the open time of Media Heavy Body Paints, thin out paint and increase paint transparency. Use Glaze Medium to create layers of paint as well as add a glaze effect to mixed media projects. This package contains one 4oz jar of glazing medium. Acid free. Non-toxic. Conforms to ASTM D 4236. Made in USA.