This is definitely my preferred flat finish over enamel or lacquer paint finishes. Mix it 1:1 with hardware store lacquer thinner and have never had a problem with it. It doesn't seem to be super flat when sprayed over a gloss-cote (as I will put down gloss-cote for decal adhesion, then flat-cote over it), so for an even finish, you have to gloss-cote everything on that surface so the semi-gloss effect doesn't stick out.