All latex paint formulas will exhibit this tendency to some extent if applied in areas that repeatedly become humid (bathrooms, for example), especially in ceiling areas.
Painting in cool, humid conditions, or just before or after rain. The longer drying time caused by these conditions allows the paint’s water-soluble ingredients to rise to the surface before the paint thoroughly dries.
Avoid painting when temperatures are below 50º F in the late afternoon and if cool, damp conditions are expected in the evening or overnight.
If the surfactant leaching occurs in the first few days after the paint is applied, the blotches or stains can usually be rinsed off with a strong stream of water from a garden hose. A month of normal weathering will remove even stubborn cases of leaching. Surfactant leaching does not affect the ultimate durability of the coating.
Never apply another coat of paint on any painted surface that exhibits surfactant leaching.
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WHAT SHEEN DO I NEED?
About Interior Paint Sheens
Get the look you want and the protection you need for any room in your home.
A flat sheen has a non-reflective finish that touches up well and hides minor surface imperfections.
Low-traffic areas; interior walls and ceilings
A matte sheen has a low-luster, reflective finish that is durable, easy to clean, touches up well and also hides minor surface imperfections.
Low-traffic areas; interior walls
Family rooms, living rooms, kids' rooms, bathrooms, dining rooms, ceilings
An eggshell enamel sheen has a soft, velvety appearance that resists dirt and grime, as well as mildew.
Family rooms, living rooms, bedrooms, kids' rooms, hallways, dining rooms
A satin enamel sheen has a pearl-like finish that's easy to clean.
All interior surfaces; moderate- to high-traffic areas
Family rooms, living rooms, bedrooms, kids' rooms, hallways, kitchens, bathrooms, doors, windows, trim, cabinets, shutters, interior furniture
A semi-gloss enamel sheen is sleek and radiant resisting mildew, moisture and wear.
Cabinets and trim; high-traffic, high-moisture areas