Quote:
Originally Posted by Forzanerazzurri
PPG states that it's clear coat even needs to be at least 2 mils thick (50 microns or about as thick as a grocery bag) to be able to absorb the UV with the chemistry it uses in its modern clear coat (which is incredible at UV protection). Thinking that a ceramic, sealant or wax that's 2 microns thick is going to block UV is hilarious.
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It’s probably not that the wax has to be a complete barrier. It’s that the wax has something sacrificial to offer for the atoms (which cause oxidation) to react with that isn’t the clear coat or paint or resin.
Also above and beyond washing, waxing is another form of cleaning acid fall-out that the UV can’t react with and cause damage.