Hank's experience echoes mine. I kept my LS-3 (same airfoil as PIK-20B;
also Mosquito, Nimbus 2, etc.) at 400 grit most of the time and it did
seem to make a difference in the rain. Keeping it clean was no problem.
Water worked for most things. And for stubborn bugs, just sand them
off.

Chip Bearden
ASW 24 "JB"