As long as it doesn't have cleaners in it.
I will disagree. In general, because of the formulation, even "pure" carnaubas still need solvent agents to allow for workability. The solvents of the new layer will remove most of the previous layer.
It is possible to layer them using a "spit shine method" (mist the waxed paint with distilled water before applying the second coat) but that is a cheat. Some newer products, sealants and synthetic hybrids allow for more layerability, as the solvents in the "uncured" product don't affect the "cured" product, something similar to water and concrete... water is the solvent for concrete, but once cured, water won't dissolve it. Not all sealants and hybrids allow layerability, and even those that do, 4-5 layers is the practical maximum.
This is not a knock on carnauba, as I am personally a fan of carnauba, and think that the look it provides on reds and darks, specially black, is unmatched by any sealant and even the hybrids. It is not that they are less durable either, as a carnauba like Collinite 476S or Collinite 845IW will outlast practically any sealant. Just setting the record straight.
Alex