» “Piling on” the undercoat in heavy and wet coats. Solvent is trapped in undercoat layers which have not had sufficient time to set up
» Material not uniformly mixed. Because of the high pigment content of primer-surfacers, it is possible for settling to occur after it has been thinned
» Improper thinner/reducer selection
» Improper surface cleaning. When not properly cleaned, primer surfacer coats may crawl or draw away from the edge because of poor wetting and adhesion
» Improper drying. Fanning with a spray gun after the primersurfacer is applied
will result in drying the surface before solvent or air from the lower layers is released
» Finishing grit of sandpaper too coarse

» Apply properly reduced primer-surfacer in thin to medium coats following recommended flash-off time between coats
» Stir all pigmented undercoats and topcoats thoroughly
» Select only thinners/reducers that are recommended for existing shop conditions
» Thoroughly clean areas to be painted before sanding
» Use proper sandpaper grit before applying polyesters or undercoats
» Follow product recommendations per
its Technical Data Sheet

» Thoroughly dry affected area
» Sand, isolate if necessary, and refinish