Wood glue. I've done it with a table top. One problem. I didn't
finish one table fast enough [let it lie for a while] and a wide
center panel warped ever so slightly ....enough to make the difference
in that material which is BAD on a side-view. A visible slit, however
slight, between materials is enough to cause major problems later.
It's still leaning against the wall until I decide how I might want to
reuse the material.
So, glue up as you usually would [wood?] and make sure you finish both
sides with a few coats of varnish to take care of moisture problems.
If really concerned about moisture, don't use MDF which acts like
highly compressed paper. It's much like paper from a side-view with
regard to strength and moisture expansion and separation. Also, a bar
will have drunken woodworkers banging their beer glasses on it with
cries for more booze, so I'd go for something more substantial in the
first place. Live a little: Solid oak.
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