I'm painting my big Dragon Railway Gun and have painted the large barrel with ta first coat of Tamiya's gray acrylic. I thinned it with a lacquer thinner and it looks great...but it needs, of course, a second coat...Now, can just put on a second coat of gray directly after the first coat properly dries, or should I follow the first coat with either a clear gloss or clear flat, and THEN spary a second coat? Any help would be appreciated as always...