Direct sunlight, particularly in southern or western exposures, can accelerate the migration by heating the wax allowing it to become more fluid and more mobile. As you would expect, dark, heat absorbing colors will also accentuate this condition.

SOLUTION: Areas of discoloration should be cleaned with a hot water and detergent solution. In cases where the wax migration is severe, the surface may require cleaning with an appropriate solvent such as mineral spirits. Rags or cloths used to apply the solvent should be changed frequently and the surface allowed to dry before painting.

After cleaning, the surface should be primed and recoated with a high quality based or solvent based paint.