What would happen if I...

[Don]

...just wiped on, then wiped of some #20 on top of the two coats of #16 on the car....

...maybe I'll just go outside and put another coat of #16 on the car...

[Inzane]

Carnuabas on top of polymer sealants is generally regarded as the better way to go than polymer sealants over top of Carnaubas. Try #16 over #20 next time.

I've only just started using #20 a little while ago (my first polymer sealant type product) and am about to try NXT, but my understanding is they shouldn't be applied directly over a wax.

[Don]

Well the 3rd coat of #16 won out, but just for fun I DID put a coat of #20 over the #16 on the front bumper cover...