Well this must be the week for Fiberglass questions.
As to your question the best RV wax for Fiberglass...lots and lots of options. What's your goal? Absolute shine/reflection or is it protection, or durability and or longevity.
Reality is, Fiberglass isn't as much of a mystery as many make it out to be, but it is actually easier to care for and protect than metal, particular the "corrugated garbage" used on TT and older RV's.
After years of owning and selling an award and show wining custom and exotic restoration and paint shop, I still like to "play". I just "restored" the exterior of a 2001 Bigfoot (all fiberglass exterior). It was totally oxidized from years in the Florida Sun, and then more years of neglect in the winters of the northeast. The process included three passes of chemical and four passes of a pressure washer, followed by one hand application of cleaner wax.
For S & G I did one half the rig one way, the other half the other when it came to the final waxing.
I gotta tell you, the end result is nothing short of stunning. A real tribute to the quality of gel coat applied by the maker Bigfoot.
So I begin with 3M Rapid Cut Compound on a machine with a wool pad. That was followed by a pressure wash and Meguiar's Marine Clean and Polish on a sponge pad to eliminate swirls, and remove any remaining oxidation as well as "oops" from the Rapid Cut.
WARNING: If you don't know what you are doing, do not attempt the Rapid Cut on anything. It will burn right through paint before you can say Oh Sh*I, and it will damage gelcoat fairly quick if you hesitate with the machine.
Better to do it by hand in an isolated area that is being problematic or is in really bad shape. Or go with an orbital buffer.
Anyway, with the second process (Meguiar's) done and power washed, the subject surface should look awesome. If it doesn't go back and hit it again.
WARNING 2: Do not leave this surface exposed to the elements for any length of time. It is as unprotected as a new born child at this point. It will water spot, stain, and otherwise deteriorate super quick left unprotected.
Finally (this is where you have to decide what you want most from your finished finish). I hand applied Meguiar's Cleaner/Wax.
Now...before you get all brand crazy on me....there is nothing sacred about Meguiar'. I've won shows with Meguiar', Mother's, and Zymol as well as Wizard's. If you have time and inclination, I'd say put a coat of each on over a four month period.
Mother's is super durable, but not super high luster. Zymol is super easy to apply, remove and hard to beat for shine, shine, shine or maybe that should be reflection, reflection, reflection. Meguiar's is a nice blend of the two. Wizards is the one I'm least experienced with, but it does a heck of a job and is somewhat easy to work with. Hard to be Zymol on top of the Meguiar's or Mothers....it really brings out the clarity in the reflection and the couple combined give and easy long lasting durable finish that is very high gloss and easy to renew with a spray every three to four months.
More than you wanted to know I'm sure, but as you might be able to tell, I'm kinda into to bright shiny reflective stuff.
Smile on, wax off.
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