Easy enough to test if you want to.
Take a scrap board of the same type of wood you're going to use, finish
it the way you're planning, and measure it when dry (maybe heat it at
100 d Far. in an oven or something) then again when it's good and humid.
(Maybe keep put it in the bathroom for a few days when you family is
taking hot showers) Measure it and scale up for the width of your table.
The best argument against democracy is a five-minute conversation
with the average voter. (Winston Churchill)
And take into consideration that the scrap of wood is not going to
move enough to cause a problem. A wide table top however could move in
excess of 1/8". So multiply the movement measurement accordingly.
Comparing movement in a floor, where all the boards are parallel and
growth and shrinkage is all in the same direction (across the grain),
to a door, where the boards are arranged in a fashion designed to
reduce or eliminate movement across with width of the door (the panels
may expand/contract within the frame bounded by the rails and the stiles
but neither the rails nor the stiles will change in length, thus you
won't see any changes at the margins. Apples != Oranges.
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