You don't want to paint the inside of your box's , but I prefer to paint the edge but be prepared for the box's to stick together unless you coat them with something , you can paint the edge of your inner cover but I don't paint the inside . I don't paint my entrance reducers if they get old and funky there easy to make , I do paint my entire bottom board ( solid ) and I paint my top covers and put aluminum on them . Basically try to paint anything that comes in contact with the weather and not paint anything that would bother the bee's .I use Bin primer one coat and two coats of a good latex topcoat.
Correction the correct primer is Zinsser 1-2-3 , good product .
Correction the correct primer is Zinsser 1-2-3 , good product .