I'd wait for the full cure period to be over. Now, why are you doing 3 coats of sealant? I know some are fan of 2 coats but 3? I could be way off but IMO the solvents in the sealant will basically undo what you just did on the previous application. When you do 2 coats it's more for full coverage than really adding another layer. Three coats IMHO is a waste of time. The wax can be added for additional gloss but you're not getting extra protection. If I were you I'd just add the wax tonight and be done with it, skip the 3rd coat of Klasse.
Also, wait for more expert detailers to chime in, maybe I'll learn my opinion is totally wrong![]()
I have used klasse sealant glaze. It was not my cup of tea. I did "research" it and read people saying that 3 was the magic number for that product as far as looks