When cleaning paint after the airbrush has (visibly) run out of paint, I always pour airbrush cleaner in the gun's paint cup, suck it up and blow it back several times with a pipette. It draws paint residue (paint particles and flakes) into the pipette that I blow from the pipette into the spray-out container so that paint particles and flakes will not clog the nozzle. I do this until no more particles and flakes are visible in the pipette. After that I blow cleaner through the airbrush and also draw back and lock the needle and put my finger on the tip of the nozzle to reverse the flow of the cleaner in the airbrush in order to release stuck paint residue from the airbrush. After that I blow cleaner and finally water through the airbrush.
When cleaning in such a way, it becomes obvious that most paints form particles and flakes that are left in the gun after the airbrush stopped spraying paint. Createx does it, Holbein Aeroflash, Illu-Color and Vallejo Premium all leave some type of residue inside the pipette and on the inner wall of the airbrush paint cup when cleaning according to the method explained above. However, this is not the case with the relatively new waterborne Inspire H2O. The pipette and paint cup remain almost entirely clean.... The first paint I used that has this excellent property.
I also noticed that while mixing the paint before spraying, for which I also use an other pipette to thoroughly mix the paint and reducer, Inspire H2O hardly left any residue in the pipette after the mixing was done. I think that is a sign that the pigmentation is very fine and the binder and solvent are doing a great job. Spraying with Inspire confirmed my suspicion; the paint performed miraculously well in my Iwata Micron SB. Below you see a test that gives an indication of how well this paint behaves.
The measuring scale is in centimeters
To spray the text shown above I used Inspire H2O in the following ratio: Paint : Reducer = 1 : 15 setting the air pressure just high enough to drive out the paint (somewhere around 7 psi or half a bar). But what is more amazing is that after leaving the airbrush untouched for 3 hours (with the paint still in the cup) it sprayed just as well as when I first sprayed it. And it gets better: same thing after 6 hours...., as if spraying with freshly mixed paint.
Inspire H2O 'Black Smoke' and Reducer I used for the test
Another positive property of the H2O paint is that it hardly leaves any tip dry. In this respect it is on par or better than solvent-based paints. And as you can see, the testing was done with black, which traditionally is a 'difficult' color (gross pigment, clogging and tip dry in most brands). Next week I am going to buy other colors of this type of paint and continue to experiment with it. No need to say I am quite impressed by this new paint for airbrush artists.