Amsterdam Acrylic Gel Mediums are the ideal choice for artists, students, and crafters interested in adding volume and dimension to their artwork and projects. These quality, versatile mediums work well with any brand of acrylic color, with a wide array of additives, and on virtually any surface. Gel Medium - This medium allows color to be extended or made more transparent without affecting viscosity. It can also be used for gluing all kinds of materials.Heavy Gel Medium -- This heavy gel allows thick er layers of acrylic color to be applied in one stroke. It increases transparency and brush stroke without affecting viscosity. It-s also great for gluing heavier materials.Extra Heavy Gel Medium - This thickest of gel mediums increases brush stroke con siderably, allowing the application in one stroke of extremely thick layers of acrylic color. It also increases transparency and can be used for gluing heavier materials.Each acrylic gel mediu comes in 2 forms -- glossy, for increasing the degree of glo ss, and matte, for reducing the degree of gloss.Amsterdam Acrylic Gel Mediums are non-hazardous and clean up easily with water.