This clear top coat allows modellers to give an overall gloss or matt appearance to their scale models. These are for airbrush use only, and are thinned with Testors Thinners. While you can use general purpose lacquer thinners to clean out your airbrush after use, we generally don't recommend using general purpose thinners for thinning the Top Coat Finish. When using Testors Top Coat and/ or any related thinners, only do so in a well ventilated area preferably with a ventilated airbrush booth and breathing gear.