Forgive me for an indulgent post. I's about a year later and I'm looking through the discussion above. I think I was trying to convey too many ideas in one go, and all of them were wrapped up within my experiences with several different waxes and cars in a humid, sometimes heavily rainy part of the country.
At or before the time of the discussion above, I'd gone too long on a DA correction using lots of GC QW. It was during a less rainy time mostly during 2013. After the discussion above, the weather patterns changed again, during 2014. There was really no way to keep up just using GC QD/QW as a WW and booster, and so I was able to see that the DA liquid wax (Gold Class) and Ultimate Polish underneath were long gone, sooner than I previously would have thought. This correlated with my other experiences with other waxes, that is, that none of them seem to stay fresh for long in heavy rains or other exposure (frequent washing and wiping).
Here's an October 2011 comment from Michael from another thread:
Originally posted by Michael Stoops
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Here's a comment I made a week ago:
Originally posted by Top Gear
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2015 has been rainier so far. I've done 3 corrections in 4 months, mostly testing my techniques, and the latest is now only a week old. To test wax durability, I've purposely QW'ed only once and very lightly, and I've not washed at all, but the car has been rained on several times rather heavily, amounting to nearly 3 full days of rain in a week's time. I've actually tested a squeegee a couple of times after the rain, touching up with a dry MF, just to prevent spotting. In short, for a week I've barely touched the car, where as normally I'd QW the surface almost daily.
The result? On the top surfaces (hood, roof, trunk), the DA wax is essentially gone, and the Ultimate Polish underneath is either exposed or already starting to wash away. It's hard to tell which or to what extent, of course, but up close these surfaces already look swirled, the finish even looks thinner (than the sides), feels rougher, and it's just not as "velvety" (sorry no pics, but I think you all know what I mean). This matches my experiences with other waxes being washed off very quickly from rain and/or washings...but still...one week.
So, I've decided to 1-step re-wax these top surfaces with the DA instead of using QW. Now that I can see the non-boosted limits of wax more clearly, I have to add this to my growing list of detailing tricks. Hope all this helps someone else

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