I've had this Meguiar's fiberglass restoration kit for about a month now.  While I haven't had a chance to use it on my dad's boat yet, I did use it to successfully clean up an old car roof cargo box that I have that is made of fiberglass.  The cargo box was looking pretty dingy after years of use/abuse and was not looking too impressive on the roof of my shiny SUV.  After using this Meguiar's kit of oxidation remover, polish, and wax I am happy to report the old cargo box have been rejuvenated (clean, shiny) and once again worthy to been seen on my car.  I found the kit easy to use and instructions were easy to follow.