I agree with those who mention heat/bonding.
I have an Omega hand held pocket IR thermometer. This past winter I would back the car into the sun to warm up the surface. At ambient 42-54 F the surface temp reached 94-101 on the hood and roof while keeping 38Fon the side out of the sun.
This temp differential had pronounced effects on my carnuba QDs , especially the PCM. I plan to keep my surface lower than 110 when doin' my
Klasse/Souveran thng next weekend.
Also blazing saturated UV rad can't e cool with uncured polymers.
