Airbrushing with craft acrylics - Model Railroader Magazine

 He suggested using a product by an art supply company called something like Gumbacher.  It is airbrush thinner.  I've used it ever since using the CeramCoats and have had no problems with them whatsoever.  I usually use about 5 parts paint, 4 parts of this thinner and 1 part water.  That mixture works well for me.