Theoretically, maybe. But you'd need to paint it on thousands of square miles(or km) to have any noticeable effect. We used to have this sort of thing naturally

Theoretically, maybe. But you'd need to paint it on thousands of square miles(or km) to have any noticeable effect. We used to have this sort of thing naturally - it was called arctic ice cover. So what are you going to paint it on? And how many tons of the paint would you need?