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Tardy said..
I'm a windsurfer too,the only way sand will get in there is if you pull it apart in sand .
Not exactly: The problem in windsurfing was mainly the very fine dust/salt that got into the mast and then got down from the top part into the junction between the two parts, as this junction moved a bit with the mast flexing on the water. The advent of sealed masts prevented it (so water could not get into the mast from the foot and bring with it this grime), but not completely.
As the board junction is in the water, this phenomenon could also happen for two pieces boards, but it seems less likely, as the junction seems more watertight and you do not have this huge potential container of dust above the junction as in a windsurfing mast.
Salt deposits can be an issue however if you keep the board in one piece for a long time, as happened with wishbones. I would think that lubricating the rods for the 2-piece boards may be a solution.