Thanks for all those great comments
@ Soul Samurai, Snoopdeville3: I don't know exactly why i put the paint on the side of the base. I normally don't do that.
After the paint dried, I just went with it. But I have to agree that I won't do that on the other bases.
@keezus: the paint is
GW's "Martian Ironearth". I think it works really nice, but you should put another (invisible) color layer on top to fix the crackles.
I put a layer of Lahmium Medium on top and then started to paint and drybrush the base.