Re-question what I quoted you above, maybe I just misunderstood the way you worded it. I thought M21 being a "professional line"series and an actual polymer sealant is better protection than just UW. UW is a syn blend, correct?, while M21 (professional version of NXT) is fully synthetic and meant to "bond"with the paint for longest/most durable?
Ult. Wax is also entirely synthetic, but is the "next generation" from #21/Nxt.
#20 is a mild cleaner/wax that is a synthetic / carnuba blend.
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