I think Riccardo and Ben have assumed you are referring to the aqueous acrylics from the Gunze range; these paints are called "Mr Hobby".
The Gunze "Mr Colour" range are actually lacquers. I started using them a few years ago because they are the only hobby paints that I can buy locally (although "locally" means across the Mekong and into Thailand; I may be the only AMIer whose LHS in in another country!).
Mr Colour paints are fabulous. They have a very fine pigment, they go on with a beautifully smooth finish, they adhere to the surface really well, and they dry very quickly.
I recommend using only Mr Colour Thinner or Mr Colour Levelling Thinner (the latter has a retarder which provides an even smoother finish). You can use commercial/generic lacquer thinners that are much cheaper, but that type of thinner can and will eat the plastic if you spill it, which is why I recommend only using the Mr Colour product. I thin with Mr Colour thinner but clean the airbrush with cheap, generic thinners.
One of the best things about Mr Colour is that any mistakes, runs, overspray, etc can just be wiped off using a swab or rag moistened with Mr Colour thinners, as it does not harm the plastic at all.
Always use lacquers with plenty of ventilation.
This message has been edited by jvenables from IP address 18.104.22.168 on May 23, 2010 10:26 PM