The specific density of water borne or water based paint is much heavier than lacquers & enamels. It is therefore necessary to use a brush with a little more body. Brown Synthetic Hair Mixture is fine for the lacquers & enamels, but a little too soft for the higher density water borne paints. We have developed a brush with a squirrel and taklon mixture to give you the desired hair weight for water borne paints. This brush can be used with enamels and urethanes. We suggest that you dedicate a specific brush to the medium that you are using.