Lapping
Appearance of a denser color or increased gloss where wet
and dry layers overlap during paint application.
Possible Cause:
Solution:
Maintain a wet edge when painting by applying paint toward
the unpainted area and then back into the just-painted surface.
This technique (brushing or rolling from "wet to dry," rather
than vice versa) will produce a smooth, uniform appearance.
It is also wise to work in manageable-sized areas. Plan for
interruptions at a natural break, such as a window, door or
corner. Using a high quality latex acrylic paint makes it
easier to avoid lapping problems because higher solids content
(pigments and binder) makes lapped areas less noticeable.
If substrate is very porous, it may need a primer or sealer
to prevent paint from drying too quickly and reducing wet
edge time. Alkyd paints generally have superior wet edge properties.
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