Boba Fett.....how do I make armor paint chips?

I have a 1/6 scale Boba Fett by Screamin'. I have re-done him a few times and I am very happy with the way he looks, except for his armor. I can't seem to get the little specks of silver to look right. These silver spots on his armor are supposed to be bits of bare armor showing through where the green armor paint has been chipped off. I tried painting silver dirctly onto the green armor, but it doesn't look all that good. I even applied some liquid latex to the green armor and then painted on the silver, so it would have sharper edges and a more irregular shape. Even this didn't give me the results I wanted. At one point I painted the armor all silver, then after that dried, applied the green paint...and then I scraped away some of the green paint letting the silver show through. Nothing has worked too well.

Any suggestions on a new technique or different paint?