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There's no definite answer to it. There are so many factors that has to be taken into account to achieve the right ratio, and it has to be learned from experiment and experience.
The mixing ratio varies brand by brand, and type of solvent used. Just use a mixing tray or cup, and paint edge of the cup with a brush and see if it's in the right ratio.
For airbrush, pour thinner to the cup, and add paint. Start from say 10 thinner to 1 paint, then test spray. If paint runs, add more paint until you are comfortable with the result.
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