I would argue that the new paint could help alleviate the issue, since it would incentivise people to decrease use of the AC. My concern then would be how polluting is the production of the new paint compared to the current version.

Ah yes. Why reduce the temperature of your car by 12 degrees when you can just alter the entire planet instead.

Like reducing the number of cars.

Ohh too much traffic! 🤔 Let's expand the freeways until you need a freeway to cross other freeways.

So... You want to turn off the sun? This has nothing to do with climate change, the sun hasn't changed intensity in a few 100 years, so sun makes things warm

Uhh, what? The problem of things getting hot in the sun?

You're right, running AC more off of internal combustion engines is a better path to the solution.