Believe it or don't, I have no idea. Never painted a room. Trim, yes. Walls, no.
My mom loved to paint, never needed to paint an apartment, and DH liked painting in our early years, after that we hired professional painters. In earthquake country, painting is a massive undertaking because the furniture is bolted to to walls. The full interior of my house hasn't been painted since 2009. We get it repainted when we change flooring or carpeting.
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