Wet sanding will produce the same temporary result as buffing/compounding. Once gelcoat begins to "die" it's really on it's way out.
2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
2018 Robalo R180 CC, Yamaha 115
Bitter Gun Owner