I painted two coats of Benjamin Moore Seaside Sand on my bedroom walls, over top of a pale beige. I checked with the staff at the paint store and they said no primer was needed. Now I’m seeing some blotchy streaks on the wall, almost like the paint was applied

Can a small amount of bleach be added to exterior solid stain to prevent mold?

I want to paint 1 wall in the bedroom. Does it matter which one it is?