@ Biskup.........and I wouldn't have said not to use Tamiya Thinner if I hadn't of tried it myself. Tamiya Acrylic thinner will gel Vallejo paint, simple as that. Not the same type of thinner what so ever. Tamiya Acrylics are an isopropyl based paint, Vallejo is a water based acrylic paint, and won't mix with the Tamiya thinner. My Badger 200 is still screwed up because of that move, even after completely disassembling, and cleaning multiple times. Maybe cutting the tamiya thinner with water may help, but then what is the point, you may as well just use all water.

@DK.....do you have anything to mix the paint in first and then transfer it to the airbrush? Empty Badger bottle that you can put everything in, shake the heck out of it and then put in the airbrush.

Black tends to be thicker anyway, as it takes so much more pigment to make black, then it does white. Never had mine come out like toothpaste however, but it is the one I have that clogs the tip of the bottle up the most. Some of the metallics are almost as thick.

Also, you say you are using water....tap? Or Distilled? Shouldn't make a difference in the thinning, as water is water. I am just wondering, if you were using tap water, I am sure even in Hollywood....the water isn't pure like Paris Hilton....(LOL...bad joke I know), but maybe there is something in the water that is keeping it from mixing well.

I know the Vallejo thinner is pricey, and you need alot of it.....but it is still the best for thinning Vallejo for airbrushing.