Hello, we just bought a house that has a brick fireplace that has already been painted. It looks like the previous owners might have done some kind of wash w/ the paint b/c you can still see a little of the brick color underneath. I'm painting the room and will have to paint over the brick, as I can't leave it the old color. I don't want to remove the existing paint as I understand it's a very difficult job, and sometime in the next few years we plan to reface the fireplace w/ tile or stone.

My question is, what type of prep work do I need to do for already painted brick? Do I still have to use TSP and prime?

Thanks!