This product is designed to maintain modelling paint brushes. Simply dip your brush into the fluid, and move lightly around. Doing so minimizes damage and distortion of the bristles over time, while also maintaining the tip shape (the conditioning fluid contains mild adhesive substances). It can also be used to revitalize tired bristles. Comes in a handy 23ml bottle. Only for use on natural bristles. Cannot be used on artificial bristles such as those made from nylon. Does not contain silicone or other substances that would cause paint to be repelled from the bristles.