Hi, I just hired someone to paint a bedroom. It is a room with high humidity located under an unfinished attic. The plaster walls are fine but the plaster ceiling started bubbling and peeling immediately. I know he plastered and primed prior to painting. He thinks adding additional insulation above

I want to repaint one wall of my daughters room that’s gotten a beating. I will paint it the exact color and finish (flat) as is there now. Will there be a marked difference in color?