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Causes:
Lap marks sometimes occur when wet and dry layers overlap
during application of paint or stain. They can be caused
by too much heat or draft during application; painting
under direct sun; painting over a porous, unprimed
surface; or using an improper thinner.
Solution:
Another coat of paint, spread uniformly, will cover lap
marks. If the finish coat is relatively transparent, or
the surface is overly porous, a second coat or a primer
coat may be necessary.
To avoid lap marks, do not paint one section of a large
area from top to bottom completely. Instead, paint in
small enough sections to maintain a wet edge. (Top to
bottom painting is appropriate on shingle surfaces since
they provide natural breaking points.)
Avoid painting on hot, windy days, since these conditions
accelerate drying time. Add thinner sparingly if it is
needed. |
