Is there anyway to THICKEN paint?

You could try touching up using the airbrush.  I sometimes take a business card, cut out a small opening about the size of the area I need to touch up and use that as a mask to airbrush the affected area.  Just don't touch the business card to the surface of the model.  Maybe keep it about 1/8th inch away.

Jesse

Solvent loss through evaporation is about the only possibility. I suggest you take a small amount from the bottle and put it in an open container (an empty bottle will do) and stir periodically for several hours. The stirring is needed to keep it from skinning over.

This is another reason to only reduce the amount of paint needed for immediate use, leaving the original paint in the original bottle. 

Thanks for the replies.

I had a large area to cover with the color and I knew that, inevitably, I had would have to use most or all of what was in the bottle, it's only a half ounce bottle. What I dumped back in was what was left in my airbrush bottle after the last coat, the paint bottle itself was pretty much empty.

The airbrush idea is out simply because I'm out of air, it's just a Kustom Kolor airbrush kit I got from Walmart for $30.00, and I don't want to spend another twenty for a bottle of propellant that I won't even use a quarter of.

I hadn't even thought of letting it dry out a bit, my thinking was that paint had two states dry and wet, when I was trying to figure out what to do. My one track mind I guess.

qmiester wrote:

I've noticed that if you have some paint that you have thinned for airbrushing and not used, if you let it set a couple of days (in a sealed bottle), the pigment and the carrier tend to seperate.  You might try to siphon out a little of the carrier with an eyedropper.  Just a thought.

Enamels and acrylics separate like that, and I'd suggest the same.

I let it sit open for awhile and was able to get just enough that was thick enough to do the touch ups so I'm beyond that stage now.

Thanks for all of the advice, though, I'll definitely keep it in mind for next time.

gjek wrote:

I was thinkin to just add some cornstarch and heat it a little bit, or was that for gravy....

That would be gravy my friend!