Sagging probable causes - application technique and inadequate surface preparation. Over thinned paint. Applying the paint too thickly. Spraying with the gun too close to the surface. Painting when the temperature is too cold or the humidity too high.
Sagging solutions - before the paint dries, immediately brush or roll out running paint evenly. Properly prepare the surface, sand glossy areas. Do not thin the paint. Apply uniformly at the paint's recommended rate. Two proper coats are better than one thick coat.
Primers and Interior Finishes - Priming is essential for better adhesion, sheen uniformity, mildew control and durability. Ask your Muralo dealer for the best Muralo interior paint for your project, in the color and sheen of your choice.