The back door on the house was a cheap, hollow-core door that had seen better days. Just by chance, there was an unpainted solid-core door in the basement, that had been left by the previous owners. I painted and mounted it. I used oil-based paint, and assumed that letting it dry for 48 hours would be enough, but I'm still getting a little paint sticking on the door jamb, so I might have to repaint it at some point. However, for now it's a much more solid and secure door for the house, and much better looking too. Now if only I could get around to finishing the rest of the paint on the house. That's coming soon.