Have you guys ever checked the temperature of wheels after driving? Most wheels on street driven cars rarely reach 90 degrees F.
I drove my wife's car (factory alloy wheels) from here to Livonia, MI, (about 2.5 hours) at 70 MPH. When we arrived, I gauged the temp on each wheel and the highest temp was 92 F. The outdoor temp was 94.
Here is a temp gauge on a 2011 Ford Edge after arriving at work. Travel distance 54 miles averaging 65 MPH.
I use regular sealant, collinite wax, or a detail spray to treat clean wheels. If sealant/wax can withstand the 140-180 F temp of black paint in the sun, why wouldn't a sealant or wax be able to withstand wheel temps.
How many wheel sealants stress the importance of temp resistance? Very few. I believe it's of little importance unless you're driving for NASCAR.