I do a lot of boats, nothing that big, here is my opinion.
You have to charge by the hour.
Better have a rotary.
If the oxidation is such that you can scrape it off by your finger nail....you are in for a long haul. Get a 3M white scrub pad, and wash it and scrub off the oxidation. I would then either wet sand or heavy compounding M105 is a good starting point, if you need something stronger use wet sanding via an air sander. Lots of wool pads, clean often. If you work 105 right, you can finish a white gel coat pretty nice.
Use Megs #3 or #81 as a hand polish or PC it on, working it well into the gel coat.
Top it with Megs Flagship marine wax (hybrid wax).
If you can forgo the Megs 3/81 I would top it with Opti coat, and this way the owner can get 3-5 years of protection.
I would guess you`re looking at 18-25 hrs on a boat that size. It takes me 14 hrs to restore an oxidate gel on a 21` ski boat.
Cheers,
GREG
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