I have had some luck painting stuff and selling it on eBay in the painted condition. Maybe it was not worth the time spent, but it was fun.
The common feeling amongst buyers, myself included, is that painting is done to hide defects. So when selling such things, I always include photos of them before painting (but possibly after cleaning).
Here are some pictures:
Enormous 2.5 inch Impact wrench:Wilton 500S vise I kind of like bright colors and color contrasts. Would you say that these tools look more like toys, or do you visually like the colors?
The vise probably was bought by a hobbyist.
This Ingersoll thing, definitely, is for serious, burly men who are paid big bucks to do big jobs.