Tri-Art Gloss Polymer Medium - Gloss Polymer medium is used for thinning and extending any viscosity of acrylic paint. This translucent medium dries to a clear, flexible glossy film which has excellent resistance to water and ultraviolet radiations. Low viscosity makes it an ideal glazing medium and top coat. Gloss Polymer medium is extremely adhesive and can be used in collage and craft applications such as decoupage. Gloss Polymer medium can be added to resoluble water based paints such as watercolors and gouache to increase water resistance and flexibility.