i went to the store and asked the guy which paints are better to undercoat with vallejo black, or citadel chaos black. he goes vallejo are thinner and citadel are thicker, most people use citadels so i would go with citadel. How strange i thought the thinner they are the better. If it is too thick it ruins the detail, so i was thinking i should get vallejo not citadel, he told me the exact opposite, i do not get it.