PostShading with Paashe H

Jose
First off, I would highly recommend that you use the Tamiya thinner for Tamiya acrylics. That being said, you might be able to get away with using alcohol.

For fine lines, here is a start: 50:50 thinner to paint ratio. Spray at a low pressure around 10psi. And spray as close as you can without getting runs.

As with most things, experimentation is the key to success. But this should be a decent starting point. But the general idea is – for fine lines you want: more thinner, low pressure, and spray pretty close to the surface.

Good Luck

I too use the Paasche-H for all sorts of effects. For post shading I would set things up as follows; Thin your Tamiya with a 1:1 or 50:50 mix-thinner to paint. To get the Paasche to spray a finely atomized spray, they require a higher air pressure and low paint volume. Change the #3 tip to a #1 tip (if you have one available). The smaller #1 tip will help facilitate fine lines. Set the air pressure to approx 30 psi and adjust the paint volume knob to spray a tiny dot. Try a couple of passes on a scrap model to judge line width etc and make any final adjustments. Hold the airbrush approx. 1/2 in from the model surface and try a couple of lines. Your goal here is to get a very thin, soft sprayed line. Your all set to go, give it a shot! I've had very good sucess with my for hundreds of models using both Tamiya acrylics and Model Master enamels.