I am not saying it does not work,it does that is one of my goto techniques for armor.
You get the best winter camo that way.
Paint the tank and decal like normal
Cover decals with silly putty
Lightly dust the tank with white paint,not too thick or it won't chip
Go to town with the water removal concentrate on the edges.
It is just going to be alot of work for all your troops to have a few chips here and there(once again the proper amout
IMO)
I find it easier to hit it randomly with the super detail and then highlight the chips.
Testors is the cheapo route be sure to thin it slightly.
The real stuff is AK interactive it is already premixed.
They have way more than rust too,I swear by the stuff.
They also sell Chipping fluid which is probally decanted aquanet
lol.
But supposedly it does the same as hairspray but with more consistant results.
You need to airbrush it though.
I like that you are using the Fine Scale Model techniques,do yourself a favor check these sites out(Missing Lynx and Armorama) they are Fine Scale sites,the guys who do real world armor.
You have no idea what you will pick up,also keep in mind all the
FW tank desingers are all Big Time FSM's
http://missing-lynx.com/articles.htm
http://armorama.com/