At risk of offending someone by posting a photo of a model I manufacture.. I used Testor Acryl custom mixed paints on this model, with no primer except light grey in the orange areas. I then used miscellaneous decals, applied MicroScale gloss finish, then masked and sprayed the patches on the unit, weathered a bit more, then used Testor Acryl flat to finish. To my mind, this is the best system, because decals go on top of gloss finishes best anyway. I like Testor Acryl paints because of how amazingly they mask and dry. They dry quite :?glossy, which is how the prototypes started. I even the surface post-decal with the Micro Gloss, then add the weathering, which I consider the flat finish part of. I often don't spray the entire unit with flat finish, because if you look at prototype units, there are only flat areas if the unit is quite dirty, or in specific areas that get hotter or wetter.