Knock laps down with a sureform, it's cleaner than sanding.
For handsanding, start with 60 lightly...for HAND SANDING! Progress to 80 and 120 for pinstripe areas. Cold weather gloss covers 80, but not 60. Warm weather you gotta sand finer.
I sanded over 100 boards at the beach, jumped in afterward to dust off. SanFrancisco.