Lots of previous threads on this subject. Lots of different recommendations.
I would not use a wax. I am too lazy to remove and replace one or two times per year.
I put Poly Glow on my fiberglass TT a couple of years ago. It made getting the bugs off the front easy. It is still working today even though the recommendation is to reapply it once per year. It does not yellow. It does not peel or otherwise require removal before applying a fresh coat.
Someday I may hire a young person to reapply.
Get the kit. Clean correct tools are vital for a good job. Follow instructions exactly. It is not a wax. It needs to be applied according to instructions.