Add Retarder to Ceracolors to increase the open time, for "wet-in-wet" techniques and to reduce skinning on the palette. Do not add excess Retarder or paint will not dry.What Retarder Additive Can DoCeracolors Mediums, Gels, Pastes and Additives offer artists unlimited control of Ceracolors water-soluble wax colors. Use mediums to control transparency, viscosity and consistency. Ceracolors Mediums can be thought of as colorless wax paints, as they are composed of the same or similar waxes as are Ceracolors paints. They are the "glue" or binder that dry to form continuous, durable films.This section lists some typical uses of Retarder Additive, but it is not intended to be exhaustive. New and different ways to successfully use these products are always being discovered.Extend Open Time: Adding Retarder to Ceracolors can increase the open time of the paint for "wet-in-wet" techniques and reduce skinning on the palette.Make Paint: Add Retarder to Fluid Medium to increase the open time of the paint you can make from dry pigments.DirectionsAdd Retarder dropwise to Ceracolors to increase the open time and to reduce skinning on the palette. Do not add excess Retarder or paint will not dry.CompositionCeracolors Retarder contains propylene glycol that helps to maintain a "wet edge" to Ceracolors paint.Health and SafetyThere are no acute or known chronic health hazards associated with the anticipated use of this product (most chemicals are not fully tested for chronic toxicity). Always protect yourself against potentially unknown chronic hazards of this and other chemical products by keeping them out of your body. Do this by avoiding ingestion, excessive skin contact, and inhalation of spraying mists, sanding dusts and vapors from heating. Conforms to ASTM D-4236.