Which paint thinner?

You most certainly can. That or mineral spirits, with enamels.

Personally, I've found I get better consistency (and less odor) out of the modelling thinners. I use the good stuff to thin and the harsh stuff to clean up with.

So I understand you to say that it is ok to to use the hardware store stuff to thin enamels with, but you get better results from the model paint thinner. I've tried mineral spirits (the one in the white plastic jug with a green label), but find the milky  color of the mineral spirits reduces the color intensity too much.  Is there a clear mineral spirits?    What about Turpenoid from the artist's section at the hobby shop?

Dan the Man

So I understand you to say that it is ok to to use the hardware store stuff to thin enamels with, but you get better results from the model paint thinner. I've tried mineral spirits (the one in the white plastic jug with a green label), but find the milky  color of the mineral spirits reduces the color intensity too much.  Is there a clear mineral spirits?    What about Turpenoid from the artist's section at the hobby shop?

Where are you buying? I know what goes for mineral spirits here in the US is often called white spirit elsewhere.

The mineral spirits I buy are Crown Low Odor Mineral Spirits from Lowe's. Comes in a blue metal tin. It's absolutely clear. 

I haven't used Turpenoid...I know it's recommended for pin washes because it does the capillary thing so well, but it evaporates extremely quickly so it may not be best of the airbrush. Personally I use oils and Mona Lisa Odorless Thinner for washes. Stuff's very mild. It thins the oil paint but doesn't mess with cured enamels (though I'd recommend a clear coat anyway, just in case!).

You can use lacquer thinner as well, it dries much faster, just don't pour any unused thinned paint back into the bottle...you'll kill the paint in the jar prematurely.