Paint base coat (aluminum) add chipping fluid where you want it (don't overdo it). Shoot top coat. Let each dry well before next. After top coat is dry (acrylic) use a stiff brush or toothpick and get area wet with water and start working it.
I took a toothpick to apply the chipping solution in areas I wanted it. Panel lined and wing leading areas, I used more in the wing walkway than other areas. I just applied a tip of it from the toothpick speckling here and there.
I'm relatively happy with the results I was able to get.