The most important part of your flocked foam roller cover setup is the roller cover, also known as a sleeve. It's tempting to buy the cheapest cover available and throw it away when you're done. But you won't mind the few extra minutes of cleanup time once you experience the difference a good roller cover makes. Cheap polyester roller cover paint roller don't hold enough paint to do a good job. It'll take you four times as long to paint a room. And you'll likely end up with an inconsistent layer of paint, lap marks and built-up ridges of paint.