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I'd highly recommend NXT 2.0. This is a synthetic sealant that holds up much better to the heat than a carnauba wax. Carnauba will begin to evaporate at 160°F which is easy to reach on painted surfaces in the hot AZ sun.
NXT 2.0 has a great reflective shine and lasts a long time too. On my cars, I follow-up with Meguiar's Ultimate Quik Detailer (UQD) after every wash to keep the surface slippery and shiny.
Be sure to invest in a good windshield shade and use it regularly to keep your interior from fading and deteriorating.
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