When you get it sanded to your final grit, wipe on some "Teak" oil. Let it soak for about 15 minutes, then wipe off the excess. Next day, rub the living "snot" out of it with a coarse rag (blue jeans material, or one of mama's face towels).
This will seal the fibers and make things look "purdy".
P.S. ............. I think the common spelling is "Micarta"
Robert