I picked up some of my ideas from the wooden boat pros in my harbor, on how to treat my- now 54 year old- fiberglass CCA era yawl.
Gel coat is a faint memory on boats of this age(many owners are in denial,...). For some old boats, that will mark a cross road in it's future(or lack of). A professional glass topsides paint job with state of the art coatings is a big investment. In some cases(and these casing are growing), more than the value of the boat. Skilled labor $ is headed to the moon(I'm in the home design/build field and witness the rise daily).
The wooden boats nearby that I've been studying for a couple of decades, have a different way of treating topsides. Even modestly maintained wooden boats get a brush applied coat of paint fairly regularly. That's because a 'coat of paint' is easy and cheap both in cost and time.
The carte blanche woodies I photograph get a more involved 'coat of paint'. There's an ongoing fairing program that simply seals topsides seams and new dings. That takes a bit of time, but it's nothing in $ compared to the typical 'awlgrip' investment of a glass boat that's gelcoat has seen it's last wax job. In fact, I've watched the pros brush(not even roll and tip) apply a finish coat to a 40'er in about 5-6 hours, with a resulting quality, that is simply unbelievable!
So I've picked up the wooden boat topsides treatment for my old glass hull. No, I don't get anywhere near the quality of these wooden boats. But my process of staging, light sanding with an orbital sander, taping-a roll and tip coat of single part enamel, is a relatively easy 2 day system. The actual coating takes about 4 hours(I actually enjoy it painting with a brush) and 2 quarts of paint.
I get 3 years out of the coating. I could improve the result and duration with better prep, better skill and a two part paint. But I will never forget the nightmare of removing the failing awlgrip from my hull 15 years ago(never! but that's a different post altogether).
So while I don't think there is much needed for these old hulls in structure, even 50 years on, I do think 'cosmetics' will send some hulls to the landfill that might be saved by this 'wooden boat' process of painting.