You will then be armed with enough information to make a much more informed decision on the best product to use, how difficult or otherwise it is to apply, and how well it lasts compared to the other products available.
FWIW I would definitely apply a protection from new. There's no better time to do it. The gelcoat will probably never look as good as when new, so you'll want to retain that look as long as possible and delay any deterioration from weather and uv.
excellent link Trundlebug, that was an hour of reading well worth the time... what a great piece of work!