chassis black is what i used it is ment to stay slightly soft thats how it doesen chip! its a paint that is designed to be used on chassis's and underframe parts getting batterd by grit and dirt
i gave a ring to my old paint supplier to see if i could get whats best for the job and was pointed to hum drum chassis black and the bloke giggled and said i could have some free if i paid for postage of a 45gal drum ! tuned out cheaper to buy a 5l tin
still have half left