I usually take some chaos black and leave small uneven streaks along the damaged area I want, when it dries I apply a bit of boltgun metal on it in random areas in the black to show it chipping and worn out. It works quite well with bullet holes (if you have a drill).
I seen a lot of people take those foam pieces that come from the gw blister packs that hold metal models, and dip them in chaos black. then dab them onto areas that would have paint chipped off, then dip another corner of it in boltgun metal and dab that into and on the chaos black. It adds a nice irregular effect and looks quite natural.
the way i do it is
1:basecoat where you want the damage in the lightest colour you highlited
2:fill the inside chaos black with some of the basecoat showing in the edges
3:add mithril/chainmail inside with some chaos black showing
hope that helped
Remember guys this isn't the place to give the OP tips to paint them.
This section is where people make threads requesting for tutorials, so the correct way to respond to this would be to create a new Tutorial for painting Battle Damaged armour or linking to a current Battle Damaged armour tutorial
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