Only certain waxes can be layered. It has to be a specific formula and you have to apply it very carefully to layer, and no carnauba car waxes can not be layered reliably. It becomes far too brittle and will simply flake off.
https://bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=3072196
Not all waxes are created equal. Shoe polish and floor wax would make a very poor car coating even though they can be layered. They are high build up but their low melting point would make it very soft on a hot car. It would simply melt off.
You're still basing your layering theory on bad science. If Rejex only forms covalent bonds between Rejex molecules, than why doesn't it cure like any other layerable substance like paint, high buildup waxes, acrylic floor sealants, as in once the substance cures into a true coating, subsequent coatings can be measured and build up quite rapidly. And the way they behave when applied doesn't dry into a dusty layer to wipe off. If whatever you use dries into a dusty layer it's basically showing you that it can't be layered.
Basically the way these types of sealants work is a lot like a wax. Only they end up being more durable because they bond more strongly because of covalent bonds to the paint, that's the curing part. Wax simply bonds with weaker hydrogen bonds to the hydrocarbon ends on paint helped by the solvents working their way into the paint. Once the initial layer is bonded to the paint the molecules have oriented themselves in a way that the non-polar ends of the molecules face outward. This makes an essentially non-stick surface, and it's also non-stick to the very same molecules trying to bond on subsequent applications. That's why 1 coat, 10 coats, 100, 1000 coats even will never yield a measurable increase in thickness.
And I'm sure 10 coats will last longer than 3. But they way it works is just like any other non-layerable coating. You're getting diminishing returns on investment. Unless you can prove to me that 10 coats will last 5 times longer than 2 coats. Which it will never do. Because if it did why not just put 50 coats and not do anything for several years?
When it comes to paint, a single coat of clear like they do on cheap Maaco jobs lasts about 3-4 years without care. 2 coats will definitely last almost double. And put on three or more coats and with some care and waxing you'll easily get 20 years or more out of it. Same hold true for my shoes, I haven't stripped and reapplied them for years since being in the navy with as many coats of wax it has all I do is touch up the shine and fill in gouges but they've been protected just fine because of the amount of protection I put. Why doesn't Rejex and any other paint sealant other than the hardcoats behave like this? I know that if you go nuts with Opticoat you'll get multiple microns worth of extra protection easily measured, only problem is your whole car would look like a bunch of splotchy high spots. And Opticoat doesn't dry into a dusty surface, when it cures it cures like a clearcoat. Wipe on walk away is the description. Just like paint, apply and let dry.
So if Rejex truly were layerable, additional layers should easily increase the durability by as much as the single layers initial durability.
This isn't some random belief I hold just because. There are far more qualified chemists that have already debunked this belief.
http://www.meguiarsonline.com/forums/showthread.php?2167-What-s-the-deal-with-quot-Layering-quot
Basically if it applies like a wax, hazes and you buff it off. It can not be layered.