Tri-Art mediums have been formulated to provide artists with an endless range of textures, effects, and finishes. Tri-Art Polymer Mediums have a similar consistency to Tri-Art Liquid Acrylic paint - the ideal medium for extending color and creating rich glazes. Tri-Art Modeling paste provides a high relief textured ground that can even be sanded or carved! Tri-Art Gessos are smooth, flexible, sand-able and absorbent. Tri-Art Sludge Gesso is the most economical and ecological gesso while providing an opaque and flexible ground. Tri-Art Top Coat Hard is designed as a non-removable final coat for rigid supports. It dries glass clear to a tough, scratch resistant, glossy finish.