Sealing MDF on Router Table

My first post - I have just purchased a Kreg benchtop router table. The table itself is laminated on both top and bottom, and edgebanded on all 4 sides. The fence moves in slots cut through the MDF, rather than in aluminium tracks. Just wondering if it would be would be worthwhile sealing the sides of the slots and the plate insert with a couple of coats of something like polyurethane to prevent the absorption of moisture, that over time makes MDF swell and go "furry" (like my old Triton router table MDF bits).

Also the fence cheeks, although laminated on both sides, have raw MDF on all edges.

I want it to last, but don't want to waste my time if there is nothing to be gained by doing it. Any advice welcome.