Good acoustic guitars are finished with a balance of protection and playability in mind. To that end, the laquer must be thick enough to protect the guitar, but thin enough to not dampen the tone. An additional coat or two of paint would brobably affect the tone, if only slightly.
I personally think that painting over a beautiful wood like spruce is about the stupidest thing an instrument owner could do...then again, there was a legendary mandolin player (who shall remain nameless) who painted his '23 Loar with BAKE-ON FINISH, and put it in the oven at 325 degrees.
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