For the first time I used undercarriage spray on the frame rails and exposed suspension parts of my truck. I was dubious but initial reaction is that it looks real nice. It returned everything to a dark, flat black. I don't know what to expect for longevity but I'm happy for now.
As I recall, HydrO2 and Bead Maker are especially vulnerable to freezing. I don't have space to store every chemical inside so I want to prioritize. I'm thinking some of them can spend the winter in the garage refrigerator at 40 degrees F instead of risking damage. What other chemicals are...
I would have to think about using it on rubber seals. I'm not familiar with this product but would be cautious about leaving a film on the painted metal bits the seals contact. I've been using 303 rubber seal protectant which is water-based (actually pretty runny) which is designed...
I do think Uber has issues with being in the sun. I had blotches after using it this weekend, which cleared up with some APC. They weren't as bad as yours, though. McKees 37 SiO2 wash is what I'm going back to, it works fine in the sun.
Two things come to mind: 1) the ceramic will shed the outer layers pretty quickly, 2) the ceramic is a superior surface than any sealant or wax. They are wasting their time, IMHO.
This morning I tried the Wolfgang Uber SiO2 wash and it left soap scum all over my truck. I guess I'll try it again another day, but so far I'm not sure what the fuss is all about. McKees 37 SiO2 wash works perfectly, I should just stick to that.
In general, a good strategy is to put the most durable coating closest to the paint. Whether that's TWS&S or HD Poxy I couldn't say, there are great stories on AGO about both.