303 Protectant or Nu Finish for Smooth Fiberglass RV Finish?

Thanks to all who responded. Much appreciated! FYI, I heard back from the manufacturer of 303 Aerospace Protectant, and was advised that the product would be fine for the smooth gel-coat of RV exteriors.

I'm so happy with how the finish looks after using 303 on it, that I have already done half of the TT, and will finish the other half in the next few days. Any wax, polish, protectant I might apply will weather off, the question is how long any of the products will last. So only time will tell how the 303 lasts!