PICTURE FRAMING:
An effect of non uniform colour that can appear when a wall is painted with a roller, but is brushed at the corners, architraves and cornices. The brushed areas generally appear darker, resembling the "frame" of a "picture". Also, sprayed areas may be darker than neighbouring sections that are brushed or rolled. Picture framing can also refer to sheen effects.

POSSIBLE CAUSES:
• 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 colourant, resulting in variation in colour, depending on method of application.

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 colourant-base combinations are used.

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