Avoid These Common Exterior Painting Problems
Lap marks show up as darker areas. They’re caused by painting over dried paint — in essence, adding another coat.
To avoid lap marks, work quickly and paint in sections small enough so the previously painted area stays wet until you can brush the newly applied paint into it. If you do end up with lap marks in the first coat, the second coat will probably cover them.
Brush marks left at the beginning and end of a brush stroke are a common problem that’s easy to avoid. Start every brush stroke in an unfinished area, at an edge, or against door or window trim. Then brush toward the finished area and sweep the brush up and off the work in the same movement.
If you stop the brush, then lift it off or set the brush down on a finished area to start the stroke, it will leave extra paint, which shows up as a brush mark or darker spot.
Drips, runs and sags are best avoided by constant vigilance. Check back on your work as you go, paying special attention to inside corners and edges where paint is likely to build up and run. If the paint hasn’t begun to dry, brush out the run. Otherwise, allow the run to dry completely. Then sand it off with 100-grit paper and touch up the spot with fresh paint.
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