Semi-gloss shines more than satin. Paint sheen is measured by how much light the dried paint film reflects, and on the standard sheen scale from least to most shiny, the order is flat or matte, eggshell, satin, semi-gloss, and high-gloss. Satin has a soft, pearl-like glow with about 25 to 35 percent gloss, meaning it reflects some light but in a diffused, velvety way that is not mirror-like. It has a subtle luster that adds warmth without strong reflections. Semi-gloss has significantly more shine, with about 35 to 70 percent gloss, giving it a noticeably slick, polished, and reflective surface where you can see sharper highlights and faint reflections. Because it contains more resin, semi-gloss dries harder and smoother, which increases light reflection. This extra shine is why semi-gloss is more durable and washable but also less forgiving of surface imperfections. So if you want more shine, choose semi-gloss, if you want a softer, less reflective glow, choose satin. The difference is easily visible when samples are placed side by side under direct light.
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