Details Montana Primers enable excellent adhesion and further coating of synthetic, nitro-combi or acrylic spray paints. These primers can be used on a variety of surfaces that need to be pre-treated such as plastic, metal and Styrofoam. The Universal Primer works especially well on leather, cardboards, wood and many other materials. After the primer has been applied to a surface and dries, it can then be painted. Primers are used for more efficient and permanent results. It is easy to apply, sand and re-coat.