MTN Water-based Spray Paints are formulated with low odor resins, which are water-soluble and with pigments of the highest quality. Highly recommended for fine arts and students. Perfect for indoor work. Suitable for use on all types of surfaces, including polystyrene. Fresh stains can be removed with just soap and water during the first 20 - 25 minutes. Waterproof once dry. Solid durable matte colors, featuring great resistance and opacity for all types of applications.