This may sound weird, but I found out from another boat owner that Mop-n-Glo is great for the fiberglass boat so I tried it on my boat. The surface needs to be clean but then the Mop-n-Glo goes on really easily and last fairly long too.
So, after buying my TT new, I thought I'd try it on the roof and the sides. It works great and goes on quickly! So far so good.
Another plus is that I found a generic version called Mop-n-Shine at my local dollar store for a buck a bottle! They must think I'm strange as I go in there and clear their shelves off of the product!
And yes, I do use it on the floors too!