Prima Marketing-Art Basics Gesso: Clear. Clear, matte, ground acrylic. Works well as a primer and sealer on most surfaces including canvas, wood, paper, metal, chipboard, fabric, plastic and more! Works well for a variety of color products providing a non-yellowing, clear background. Gesso is water-based, but permanent and flexible after drying. Will mix with pigments, or acrylic paints, to create a range of customized, colored grounds. This package contains one 8.5oz jar of clear gesso. Non-toxic.