X designated colors have a glossy finish while XF designated colors are flat finish. The paint can be thinned for airbrushing using Tamiya X-20A Acrylic thinner. The paint can be also thinned for airbrushing using Tamiya Lacquer Thinner. Using Tamiya Lacquer Thinner will yield faster drying results and a harder finish. For better paint brushing results use Tamiya Paint Retarder (87114) for a smoother brushstroke free finish.