There was a good article in Power Cruising this month about hull
treatments. It talked about waxes, poli-glow and the like, and
painting. They said that you had to both prep and remove poli-glow with
the manufacturer's product, as has been said here before. What I didn't
know was that it basically works like varnish. You have to put up to
six coats of the stuff on, then renew it at least annually with another
coat or two, just like varnish. If the coating breaks down and opens up
to the fiberglass, it can be repaired, but it's visible. Best to remove
the entire batch and start over if this happens. I'll still stick with
wax.