I agree that you probably should not use the synthetic on top of Carnauba. What I would do is get a nice full coat of synthetic on and then stick to the Carnauba for re-waxing. In theory the Carnauba would be the "sacrificial" layer to the elements with the sealant-type synthetic on the base.
While they do have mild cleaning properties, I can guarantee you that the Carnauba did not take the synthetic off. The finish is SOOO much smoother with them layered than it ever was with multiple coats of a single type of wax. To each his own but I am sticking to it.
Pics coming shortly..
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2013 Ford Mustang GT
374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd
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