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.
More problem solving advice
Have you noticed small droplets appearing on your fresh coat of acrylic paint? This is known as 'surfactant leaching'. Don't panic - it's a normal part of the curing process. For each problem you’ll find a guide to identifying it, its causes and solutions.
Yellowing is the development of a yellow cast in aging solvent-based enamels. It’s most noticeable in the dried films of white paints or clear varnishes. For each problem you’ll find a guide to identifying it, its causes and solutions.