No problem.
Think of a traditional car wax almost like paint. Carnauba wax (the primary ingredient in most car waxes) is extremely hard and has to be mixed with certain solvents and oils to soften it an allow it to be applied. When you spread the wax thinly on the surface these solvents begin to evaporate and the wax hardens (certain waxes will haze). Even after you buff of the residue the thinnly applied layer is still not fully hard (it is most of the way there). The trace amounts of solvent still remaining still have to evaporate for the wax to fully harden.
If you apply a second coat of wax too soon the first coat may only be 90-95% harden so you may loose a small percentage of the benefit (not enough to really tell the difference). That`s why you don`t have to wait but for maximum benefit you should wait.
Now Midnight Sun is a little different. The carnauba used is extremely refined (to the point it looks white or ivory) and it is very low in solvent. It also is armed with Wet Diamond polymers (much like a synthetic sealant) that begin to cross link shortly after application. The 8 hour recommendation covers climate extremes (such as damp or cool weather) so if you are in some where more temperate you can probably add a second coat much sooner.
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