These artist-grade acrylic mediums can be used to alter paint characteristics such as flow, transparency, gloss, and drying time for a virtually endless array of creative effects. - Grumbacher Artists' Acrylic Gloss Medium and Varnish - 8 oz jarGrumbacher Acrylic Medium, GLOSS MED/VARNSH 8OZ - Mix Grumbacher Artists' Acrylic Gloss Medium & Varnish with acrylic colors for smoother brushing and increased gloss. Or use it on its own as a final varnish over acrylic paintings, as a glazing medium, or as a glue for collage. It dries to a crystal-clear, glossy, water-resistant finish.