You'll want to repair or patch any cracks or holes with stuff called joint compound first then paint over it with a geneous coating of Kilz primer. Kilz is about the best primer out there and is very tough and long lasting. Let it dry for at least 24 hours before you paint over it. Good luck!
I have horse hair plaster walls, and you definitly want to prime first. One thing we ended up doing also to our walls is none of them where flat or straight, so we used a layer of wall stucco, then lightly sponged over it. Then primed and painted, it came out great.
Add your voice to the conversation. Click here to answer this question.