I completely forgot about these technique articles I've done in the past. It's mostly 1/35 static, but certainly can be applied to 1/16 RC.

Enjoy!

Damaging fenders:
http://ausfwerks.com//techniques/fender/main.html

Texture and smal arms damage:
http://ausfwerks.com//techniques/texture/main.html

Track armor:
http://ausfwerks.com//techniques/spare/main.html

Quick chipping:
http://ausfwerks.com//techniques/chip/main.html

Zim:
http://ausfwerks.com//techniques/zim/main.html

There's more if you hit the index button at the bottom of any of those.