yes Moko, i found that quite difficult as well, but the secret is really having the right brush
i used an artistic brush

also if you want that aged look, paint on the layer, then add a white layermask and paint with a black grunge brush on it, but make sure the opacity of the brush is reduced
that will give you the effect of worn off paint
if you subtract too much, just paint over it again with white
got that technique from a very long video that Draconian posted some time ago by a guy who designs for videogames i think
for the text i made a texture with multiple colours and then bumpmapped with said 'subtle pattern'
the scratches are just 1px pencil lines bupmapped into the texture
getting the scratches right can be difficult, you have to find the right combination of Angle and/or Ambient
a Depth of 1 or 2 is most of the times enough
