Hi. I'm going to decorate a kids room with airplane, cars and such. But is just have to be in plane/flat colors like red, green, blue and yellow ect. The walls will be light sky blue I the opportunity part and grass green on the lower part. All the different shapes will be painted on top of those baggrund colors. That is why the paint have to be opaque. (I think) I can locally buy AutoAir, Wicked, Createx Illustration, Com-Art and Trident. I have been looking at Wicked w101, primary color kit. The idea is the I'll blend the colors I need from the primary colors. But I don't know witch one is both easy to blend/mix and have a good coverage. (no transparency is needed) Thanks Thomas..