| Picture Framing: An effect of non-uniform color
that can appear when a wall is painted with a roller, but is brushed at the
corners. The brushed areas generally appear darker, resembling the
"frame" of a "picture". Also, sprayed areas may be darker
than neighboring sections that are brushed or rolled. Picture framing can also
refer to sheen effects.
Possible Cause:
Usually a hiding (coverage) effect. Brushing will generally
result in lower spread rates than rolling, producing a thicker film and more
hiding.
Adding colorant to a non-tintable paint or using the wrong type or level of
colorant.
Solution: Make sure that spread rates with brushes and rollers are
similar. Don't cut in the entire room before roller coating. Work in smaller
sections of the room to maintain a "wet edge". With tinted paints, be
sure the correct colorant-base combinations are used. Factory colors, as well
as in-store tints, should be thoroughly shaken at time of sale.
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