I followed a procedure to clean up my oxidized headlights similar to that which ChrisFix recommends in his video on the subject.
The last step is to clear coat the headlight with a product like Rust-Oleum American Accents Ultra Cover 2x, which he used in his video and I also used.
My procedure differed slightly in that I had already polished the headlight with McGuire's M100, so it was already clear and I was just adding the clear as anti-UV and yellowing protection. I put two think coats, and after I let it dry for about 40 hours, I looked at it and had some orange peel and running so I decided to add a few more layers then wet sand and polish it.
However, when I went to clean it with IPA prior to adding another coat, the strangest thing happened - when wiping the IPA across the surface with my microfiber towel the towel started sticking, with the fibers leaving an impression! I then felt the light with my hand and noticed that it felt tacky, and that I was even able to jam my fingernail into the clear, which had clearly not hardened.
What the heck is going on? I would think this clear would be completely hardened and sandable even after 24 hours, much less 40 hours in a hot desert environment. How do I deal with this situation?