Microscale Liquid Decal Film

What do folks use to thin this stuff for airbrushing?

There’s no need to airbrush this or thin this. Dip a wide brush in and lay it down. It has excellent self-levelling properties and dries in minutes.

From Microscale’s home page: Simply take a small brush and coat the image on the decal you want to use. Allow to dry for 20 minutes. Apply the decal as usual.

http://www.bare-metal.com/decals/microscale_1.html

I had the directions for brushing, but I need to cover a relatively large area, so naturally I thought of airbrushing it. Never used it before, so I’m glad to hear about the self-leveling properties. Thanks!