I can’t fill a color on my entire object with 100% RGB if i am in recording mode in one of my layers. however if leave layer recording mode, i can fill my entire object with a color 100%, but as soon as i go back to one of my other polypaint layers into recording mode, it wipes all the changes i just did. It seems like you can only paint within inside a layer, or bake all layers afterwards then polypaint.
Another problem is after you polypaint inside a layer and you hide parts of the mesh so you can work better, all the polypaint you did somehow gets messed up until you unhide everything in your object again, it seems like a zbrush bug you can’t get around .