How do flat, satin and semi-gloss finishes differ in terms of appearance, durability and washability?

Flat finishes hide imperfections in the surface. The higher the sheen the better/smoother the surface has to be if you are concerned about the cosmetic appearance of the wall. With advances in technology you can purchase flat finishes that offer very good washable surfaces (Sherwin-Williams Duration Home) or scrubbable (Sherwin-Williams Harmony), satin and semi gloss finishes are considered more scrubbable than flat finishes.

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