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I have used Prevals on at least six builds and am using them on a champaigne pink metal flake build right now. Typically, I use Tintsal universal pigments mixed with Deft gloss lacquer, no formula, just until the color is what I want. Then I thin it with lacquer thinner until it will suck up into the straw and shoot smoothly without spitting, but not too thin (see pink esquire in my photo gallery). You will be able feel it when its right. Auto parts stores tend to have the best prices, less than $4 for a propellant can and less than $5 for propellant can with glass paint mixing/spraying bottle. The Preval propellant can will have a plastic straw with a plastic filter tip. You can take this tip off and shoot small diameter metal flakes with these units (see seafoam sparklecaster in my photo gallery) with excellant results. Also, rather than using rattle can Deft, I like to top coat with quart cans of Deft thinned a little and shot through a Preval. The Deft cans say it is not for spraying, but it works fine. Using this method the top coat builds much faster than rattle can Deft and does a better job of covering the flakes. Unfortunately, I don't have any formulas or ratios, but you will get a feel for how little or how much thinner/pigment/Deft to use. It's really pretty easy.
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