Sagging is the downward "drooping" movement of the paint film immediately after application that results in an uneven coating.
It’s not a great look, and can be caused by several factors:
Application of a heavy coat of paint
Painting in excessively humid and/or cool conditions
Application of over-thinned paint
Airless spraying with the gun too close to the surface being painted.
If the paint is still wet, immediately brush out or re-roll it to redistribute the excess evenly. If your paint has already dried, sand and reapply a new coat of top quality paint. Avoid painting during unfavourable conditions; avoid cool or humid conditions, do not thin the paint and sand off any sagging paint sections.
Always apply paint according to recommended spread rate and avoid overloading with thick paint layer. Two coats of paint at the recommended spread rate are better than one heavy coat, which can also lead to sagging. In this instance, gravity is not your friend, so consider removing doors to paint, while supported horizontally.
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