Hello:

Saw in HD the other day some 1-1/2 or so laminated, butcher block type,
blocks that would make a really nice table top if stained.

Question: If I use Min-Wax poly on it, or something similar, is it a good
idea, or necessary, to do the underside also ?

Why ?

Also: for a "hard" finish as it'll be a desk top, is Min Wax Polyurethane
the best bet, or... ?

Thanks,
Bob