X designates colors that have a glossy finish
XF designates colors are flat finish
Paint can be thinned for airbrushing using Tamiya X-20A Acrylic thinner
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.