Lessons learned:
1. I washed the boat with truck-wash and rinsed with a clean water pressure-wash and sponged it dry.
2. The PoliPrep solvent did a fairly good job of cleaning and removing some of the oxidized gelcoat, but with the benefit of hindsight I should probably have used the abrasive 3M polish mentioned in an earlier post to remove the faded layer completely.
3 I found the PoliGlow gloss coat easy to apply but quite difficult to apply well. On a warm sunny dry day it 'cured' almost instantly, so in my hands it was very difficult to avoid streaks. Diluting it with water helped a bit but it might have worked better had I chosen a cooler day and kept the boat in the shade so that the polymer had time to 'flow' before it dried.
4. The gloss coat also frothed a bit, so fine bubbles were a problem, especially where the applicator crossed the grooves around the windows.
5. The window grooves also tended to scrape the gloss coat off the applicator, creating runs that had to be mopped up immediately before they cured.
6. It took about 4 coats to produce a decent finish.
Like the idiot that I am, I did my 'test run' on part of the lower stripe. When I prepped the upper stripe the next day, it proved that PolyPrep is very effective in removing the gloss coat
