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whatever the directions say to clean up with is what you use to thin with. More than likely it will be lacquer thinner if I recall correctly. I would use dyes from luthier supply houses. You can't suspend an oil base stain in a lacquer base product... you can spray lacquer over an oil base stain application, but it has to be throughly dried through evaporation. Pretty chancy though.
You'll have to experiment with cutting brushing lacquer for spray. I would consult a knowledgeable person at a auto paint store (good luck!). I would say to start with 10% to 25% cut and spray with a Preval. Brushing lacquer is slower drying than spray by nature, so it probably has more lacquer retarder in it.
You'll know when the mix is right. If it's to thin... it's gonna run before you can even build it up. If it's too thick, it will not flow well and may orange peel easily. Start with scraps... even cardboard.
I would shoot some clear sealer coats on the wood first, steel wool then shoot your color coats on until you're satisfied. Then more clear coats to protect the color coat.
Good luck!
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