These are water based, non-toxic, self-leveling and can be used either as a medium to change the sheen levels of acrylic paints or as an over-varnish for acrylic painting. Provide a non-tacky protective coating. Atelier Matte, Satin and Gloss Medium & Varnish are creamy, mid-viscosity products made from hard acrylic emulsion. They are non-removable, however they can be overpainted.We don't recommend Chroma Medium & Varnish as a final varnish to be used with Interactive because it absorbs the varnish before it can be spread over the dry paint. If you do want to use Medium & Varnish with Interactive we advise you to apply 2 coats of Fast Medium/Fixer to seal the surface of the painting before varnishing.