GlassMasking Paint® is a water-based, nontoxic, paint-like product that dries into a durable, breathable film. It is available in 3.5 and 1-gallon buckets. Standard colors are Mirror Black & Crystal White; custom colors are available. Black dries to an opaque finish. White dries to a crystal finish, thus allowing light in. Can be applied in temperatures as low as 35 degrees. Once dry, it holds up to below-freezing and above 100°F temperatures.