weight, based on the weight of the acrylic polymer, of polymerized fluoroalkyl containing monomer represented by the formula ##STR1## where R is hydrogen or an alkyl group having 1-2 carbon atoms, n is an integer of 1-11 and R. sub. f is a fluoroalkyl containing group having at least 4 carbon atoms and (B) about 10-60% by weight, based on the weight of the binder, of an organic polyisocyanate cro