Good ole gelcoat
Ah yes, the Clark Boat Company, Kent, Washington. We see a lot of those old San Juan (usually 21's or 24's, I've not heard of the 26) around the Pacific Northwest. I suspect that they have nice thick gelcoat and would benefit from the approach described previously.
(BTW - it looks like the text has lost its formatting) If the boat has never been painted, there is a nice new shiney finish waiting just a few mills beneath the oxidized surface.
For myself, I used McGuires #44, followed by Finesset II, followed by wax. That's sort of the gold standard on the Boston Whaler forum. But generally, start coarser for more oxidized hulls, and step through finer materials, and try not to skip too many steps.
Its worth it to tackle this right away when your boat is new to you and you have the energy to do this. Its a time value thing - do it early and enjoy the results.