Lapping

Appearance of a denser color or increased gloss where wet and dry layers overlap during paint application.

Possible Cause :

• Failure to maintain a " wet edge " when painting.
• Use of low solids " economy " paint.

Solution :

• Maintain an 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-size area ; plan for interruptions at natural break, such as a window, door or corner.
• Using a top quality acrylic latex paint makes it easier to avoid lapping problems because higher solids (pigments and binder) content makes lapped areas less noticeable.
• If substrate is very porous, it may need a primer / sealer to prevent paint from drying too quickly and reducing wet edge time.
• Alkyd paints generally have superior wet edge properties.