Spray your gouache with this spray to prevent it from drying out and molding over time. With this spray, you'll enjoy your gouache paint for longer. Spray two or three times on the pigmented surface. This spray is clean and easy to use.* Product features: * Completely cosmetic components. * Naturally fights molds such as mildew. * Vacuum pressure sprayer, high sealing, leak-proof, simple and easy to use.