I have not used turtle wax since my teen years. I’m sure the formulation has changed since then.
I have been using Nu-Finish which is a liquid and pretty easy to use.
Talking to a person recently that waxes RVs for a living and has a good reputation. He used a McQuires wax that is marketed for fiberglass boats.
The McQuires ceramic wax I used was even easier to use and reviews reports it will last longer than Nu-Finish. You can find it at Wal-Mart.
It’s a little on the pricey side, but so far I believe it’s worth it.
2013 F150 XLT, SuperCab, Ecoboost; Rockwood 8285WS
2014 - 57, 2015 - 91, 2016 - 171, 2017 - 107,
2018 - 21, 2019 - 65