If you're set on wood, first things first. I wouldn't recommend "butcher block", which is pieces glued up with the end-grain of the wood showing. It's an often mis-used term.
I'm sure you're thinking of a laminated strip maple top, hich has the edge grain showing. Think bowling alley.
Again, if you're set on wood, I'd use epoxy. West Systems is good.
After fabrication I'd seal all sides of the slab with polyurethane. First two coats gloss, the last either gloss or satin depending on the look you're going for.
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