Also suggest after switching boxes out, leave old one on its side on top of the new box lid. Returning bees may not immediately recognize new box (they see in the UV spectrums) and the familiar smells seem to help. This extremely effective also when moving up from nucs. Reduces drifting and other issues. 24 to 36 hours on top is sufficient. Let us know how it works out for you.
How bad is the crack? Does it make the box unfunctional or do you just not like the way it looks? Cracks are what propolis is for. So, unless the crack is a problem that makes it unusable, I wouldn't do anything. You should see some of my equipment. lol Top entrances? Ha!! Side entrances, back entrances, whatever. Bees don't seem to mind.
Squirt some glue in the crack and clamp it tightly together.
Then if it is to bad. Run it through your table saw like every two finger worth. Makes great spacers, vent , quilt box, or screw a queen excluder to the bottom of one drill a hole in it and you have the making of a candy board. Some of the ways I recycle old rotten boxes.
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