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Surfactant Leaching:
Concentration of water-soluble
ingredients on latex paint, creating a blotchy, sometimes
glossy appearance, often with a tan or brownish cast. More
likely with tinted paints than with white or factory-colored
paints.
Possible Causes:
Painting in cool, humid conditions or just before they
occur. The longer drying time allows the paint's
water-soluble ingredients — which would normally
evaporate, or be leached out by rain or dew — to rise to
the surface before paint thoroughly dries.
Mist, dew or other moisture drying on the painted surface
shortly after it has dried.
Solution:
Avoid painting in the late afternoon if cool, damp
conditions are expected in the evening or overnight. If
the problem occurs in the first day or so after the paint
is applied, the water-soluble material can sometimes be
rinsed off rather easily. Fortunately, even more stubborn
cases will generally weather off in a month or so.
Surfactant leaching should not affect the ultimate
durability of the coating. |
