Some really good points in this topic. Years ago I was using Zaino and had multiple coats on a red Mazda Miata (single stage paint). I backed the car out of the garage, drove to the neighbors garage (.1 mile) and had a bird dropping on the hood. I immediately wiped it off, and already had an etch. That was one of many events that caused me to lose faith in Zaino's ability to protect. However, there is a very good point in this article that if bird bombs penetrate paint so quickly, how could a wipe on/wipe of product possibly protect any better. My Corvette got a dropping on it at a cars and coffee meet and I got it right off, minutes later, and no damage. After polishing my Vette, I can attest that they have very hard clear, and in this case it certainly protected it.