Just make sure your painter knows of the hidden vents, and is motivated to work around them. A painter I know of (is still in the business) didn't do due dillegence with a frame I sent him, used a soak tank, filled up the stays with fluid, didn't drain fully, painted any ways and the result was a mess. then there's the painter who used a sand blaster but forgets to mask off the brake holes in the bridges (where one can hide a vent hole to the stay) or inside the seat tube (where a fast back stay could vent) and during the clear coat the sand trickles out...
Sure the painter is "on the hook" but don't we want the guy who makes out frames look really great to the public a happy camper? Andy.