Yes, you can coat verticals with polyurea concrete floor coatings. In fact, polyurea is a good choice for coating vertical surfaces because it is very durable and can withstand a lot of wear and tear. It is also water-resistant and will not be damaged by moisture.
Note: We do not grind or mend verticals, they are done for aesthetics purposes only,  unless it is a commercial application that needs a form cove. That is when there is a seamless transition from the floor to the wall.