forming composition curable film having a shock resistance and improved resistance descaled.

A curable film-forming composition comprising in a medium (i) 10 to 90 weight percent based on the total weight of solids in the film-forming composition of a crosslinking agent; (Ii) 10 to 90 weight percent based on the total weight of solids in the film-forming composition of a polymer containing a plurality of functional groups reactive with the crosslinking agent; and (iii) at least 20 volume percent based on the total volume of the film-forming composition of particles having an average particle size less than 100 nm, having a hardness value of more than 5 on the scale Moh's hardness, wherein the particles are substantially free of groups with hydroxyl functionality on the particle surface and the particles are substantially free of surface treatment, wherein the particles have an affinity for sufficient means to maintain the suspended there particles, said affinity particles by the medium is greater than the affinity of the particles with each other, thereby preventing agglomeration of the particles in the medium; and wherein the cured composition comprising the crosslinking agent of (i) and polymer (ii) has a cured softening point of less than 30 ° C.