Weathered orc (or any) armor?

[StreetBushido]

I started painting an orc today, as a bit of practice before moving on to Grimgore Ironhide, and everything has been moving along well. I've had plans to experiment with weathering and chipping on the orcs armor, but I'm unsure as to the correct method. Some parts of his armor will be black while others will be red and I want to have a similar weathered look as in these examples:
GW Gorbad Ironclaw http://www.games-workshop.com/gws/catalog/productDetail.jsp?catId=cat1300318&prodId=prod840838
GW Ork War Trukk http://www.games-workshop.com/gws/c...210004&categoryId=600003&section=&aId=3500007

I did a forum search, but most threads about weathering were about tanks and I found that the results therin did not match the ones I am looking for. Also the methods not relating to tanks were a bit too outlandish for my tastes and limited resources .

It kinda looks like you should paint the shape of the chip/paintless area black, underline it with a lighter tone of the surrounding colour and then paint part of the black area with whatever is under (metal, ceramics, etc.)

Aside from the purely technical how-to I'm also interested in tips on how to get a good shape on the areas that have been scraped clean of paint.

Any good ideas?

 

[TheDrescher]

If you're planning on using an airbrush, many people mask their miniatures using salt or sand and spray over to get a natural weathered look. One way on smaller minis is to use the sponge method. tear off a bit of the spongy material that usually comes in blister packs, get some paint on it, dab any excess off on a paper towel and then touch the sponge to the miniature. This will give you a similar pattern. This is a trial-and-error process so I'd suggest you practice on a spare piece or bit of plasticard before you proceed to your favorite mini. Hope this helps!

 

[Dragonsreach]

Aside from the purely technical how-to I'm also interested in tips on how to get a good shape on the areas that have been scraped clean of paint.

Any good ideas?

Yep think of the Cause of the damage, Swords, Arrows, Axes, Warhammers all have a pretty distinctive impact style.
So emulating the damage on Fantasy Armour becomes easier, the first three weapons would all hit in relatively straight lines.
Edge chipping is the area where random shaping is more "realistic" .