Wow. Black paint is very very time consuming. At least I got the primer + paint in one from Behr (the coverage is great enough to convert me from Lowes, oops).
Am I crazy for painting black in a rental? Yes. Is it worth it? Absolutely (so far). And as my hands and arms start hurting and I look at the rest of the huge yet-to-be-painted walls, I think "the more I make this apartment like home, the longer we'll stay, the bigger the down payment for a house, the better the house we can get".
13 hours ago