I used MDF
I have a separate top sheet on a torsion box that I can flip over when it gets too ratty. After 2+ years so far so good:
Torsion box work table/bench/outfeed tableI made this one from 2 pieces of 3/4 particle board 10 ft x 30" for counter tops. It's also got another 3/4" piece on top for a replaceable work surface. So far I haven't needed to flip it over. I sealed it with shellac which make for a really smooth slippery surface.... not always good when trying to hold something down with a clamp.
It's very strong, heavy, level, flat and stable. I flattened out the first 10 ft sheet and then glued the sides on using a 10 ft long 2" x 2" aluminum tube for straightness, one side at a time. I then added the center long strip and then filled in between with short ones, all 3/4" stock ripped to the same dimension, about 2 3/4". When everything had set up I coated all the exposed edges and then plopped the top on and used everything I had to weigh it down as well as clamps along the edges:
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