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problem interior walls

I painted bedroom walls with a very deep green about 4 years ago after a couple of years went by I noticed a film on the walls.......when I wiped my hand across it I have a film on my hands......two of the walls are exterior and two are interior so I don't believe that has anything to do with it.......a contractor told me that if deep base paints aren't mixed properly they have a tendency to break down and that this could be the problem.....if that is the problem how do I fix it, it that isn't the problem then does anyone know what would call this??.............wm

Re: problem interior walls

There is a chemical phenomenum known as "surfactant leeching" that can occur in dark, saturated colors, however, it is more commonly seen in the presence of high humidity, most commonly in baths with showers. It could also occur in high humidity climates.Today's universal tinting colors that are used in paint store tinting machines are water soluble. The tints can migrate to the surface and cause whitish discoloration on the surface. These deposits are water soluble and can often be removed by simply washing the walls.

This is often seen on exterior paint jobs that are done in the cool, dew laden temps of Fall. The dew will cause leaching to the surface of a whitish residue. Since it is water soluble, this will often disappear with age as the siding is rain washed.

A couple things can possibly help in the future: using higher grade acrylic paints that form a denser, more water resistive film, generally paints of a higher sheen. Flat paints are much more porous to moisture than higher sheen paints. Oil paints are also more resistive to surfactant leaching. Of course, lighter colors are less subject to showing this leaching.

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