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I have a Devilbiss HVLP gravity fed conversion gun. I'm relatively new to spraying and often struggle with selecting tip size. I'm spraying a waterborne lacquer that empties from a ford cup in 12 seconds. I have a chart that says I should use a 1.2 tip, but I've also read that it's necessary to go up a couple of sizes when using waterborne finishes. Can anyone who sprays waterborne lacquers regularly provide any guidance to a noob?
 

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I haven't (yet) sprayed waterborne laquer but a 1.4 on the DeVilbiss should handle anything thinner than primer. I use a 1.4 for automotive basecoats and a 1.5 for urethane clears. Waterbornes need finer atomization because they don't flow out as well as solvent based paints (this again is atoutomotive experience), but shouldn't need a bigger tip.

I'm curious to know which laquer you've chosen, I was going to ask what's available nowadays.
 
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