I have three of these folding worktables, that I can buy at Canadian Tire for $18, although they have sometimes gone on sale for $9.99. I find them very handy, but they are made of MDF, and after a lifetime of being exposed to rain and other nastiness, the tops wear out. I decided to replace the top on my oldest and dearest, and I thought Oak or Maple would be nice, but a 5" x 1" x 6' was over $20 at the HD. So, I settled on pine. I drilled dog holes to a slightly different and, I think, more useful pattern, cut a groove down the centre to hold round objects, and slapped on some spar varnish. I think it will do.
It has one coat of spar varnish now, it will have three. The second picture is what the top had come to, sitting on top of a newer folding worktable. Now I guess I should make something with it.