Have you ever painted an exterior–it looks great–then the next morning there are amber streaks or droplets marring the newly painted surface? As a Bay Area painting contractor, I often encounter “surfactant leaching”. Surfactant leaching, or exudation, occurs when water soluble components exude out of the paint. This happens with all water-based paints, but is more of a visual problem in foggy or dew-prone climates, and can be frustrating to deal with. One can often wipe the residue away immediately with a damp rag, but once dried it can be more difficult to remove.
Because surfactant leaching will generally weather of within a month or so, paint companies will often suggest letting the problem correct itself, but this is a tough one to do when you are banking on immediate visual gratification!
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