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Glossy paints have less pigment than flat paints and are less porous.
When eggshell is applied over flat latex, some of the resin is absorbed by the flat paint, causing an inconsistent sheen in the eggshell. If rolled, the top of the stipple will be glossier than the bottom of the stipple, creating a mottled look. Acrylic latex paints maintain better adhesion when wet, than most other latex paints, which often peel or wash off when wet - even if they adhered well in dry conditions. Alkyd paints tend to yellow with age, more quickly in the absence of light, and in the presence of fumes from epoxy products or from ammonia in cleaning products. Repainting will cover yellowed alkyd.