I would like to repair/refinish some plaster walls in my 1944 home. There are a few small cracks but the main issue for me is uneven texture on some slanting walls. I'm not sure if the unevenness is due to cracks that are not yet visible or poorly repaired ones from the past, but I am fairly certain it is mainly due to gravity. Does anyone know if there is a way to even out the wall texture or what type of compound to use. The walls are painted, do I need to take down the paint or can I directly apply new compound? I'm just not sure what to do, cracking isn't the major issue just unevenness and I haven't been able to find any articles or advise on this issue.