The basics Old Skin Plast (OSP) is a synthetic preparation, containing acetone, for creation of realistic wrinkles on the skin, as well as aging skin.  The uses Stretch the skin between thumb and index finger and use a brush to apply OSP. Then allow to dry.  The pro tip To intensify the effect, repeat this procedure as necessary. To take off the preparation, use OSP Remover.  The bottom line OSP contains solvents and is flammable. Do not allow to come into contact with the eyes.