I bought the best 'Baltic birch' big box had, and spent hours and hours filling and sanding cause it was painted glossy black. Never again. too many voids, etc.
the local lumber yard has much better plywood with no/minimal voids. when I buy it for jigs, and for anything beyond crude rough stuff, it will be come from lumber yard. The purpose of plywood is to be stable, and less hassle in the long run. If I make something and it looks crappy on the edge (voids) I am not happy with it. You get what you pay for 98% of the time.
David
Confidence: That feeling you get before fully understanding a situation (Anonymous)