Vallejo dries dead flat. Gloss is a result of not mixing the paint thoroughly enough. Shake it well and when you think you've shaken it enough, shake some more. Even while working on your palette and you've thinned it and are in the middle of painting, ocassionaly stir the paint up in the cup as the pigment separates quickly. Some of the colors need to be more thoroughly mixed than others and experience will show which ones. You can work this to your advantage when painting leather as personaly, I like a slight sheen to my leather bits to give them that oiled or finished look. Everything else....shake, shake, shake.