Repair & Renovation Guide 147 7.14 7.15 7.13 7.1 Poor paint coverage POSSIBLE CAUSES The possible cause could be the wrong dilution and application of the paint, a very absorbent surface, the roughness of the plaster, the application of paint directly on the skimmed surface without the use of primer. SOLUTION Most likely the surface needs repainting, considering the possible reasons that caused the problem and choosing a quality paint of high coverage. 7.2 Bubble formation on a painted surface POSSIBLE CAUSES The cause is usually related to trapped air or moisture beneath the film (coat) of the paint. It is also related to paint applications in higher temperatures (over 35°C). SOLUTION To avoid this problem, maintain proper recoating times between successive coats during the paint application. It is also important to make sure that the coats of the applied paint are not too thick. If the problem has already been created, sand the surface and level it (skim), then proceed with repainting it. 7.3 Insufficient paint adhesion on painted surfaces (paint peeling) POSSIBLE CAUSES • Paint application on a very greasy (oily) or very smooth surface. • Skipped sanding of the previous coat of glossy (shiny) paint. • Paint application on a painted surface that did not dry properly everywhere. • Skipped priming before painting. • Very diluted paint or not enough. SOLUTION The proper preparation of the surface to be painted is the only way to prevent and to avoid the problem all together. Solve the problem by sanding, cleaning, priming and painting the surface again. 7.4 Paint chalking POSSIBLE CAUSES • May be caused by UV radiation (especially true for epoxy paints), humidity, air pollution, application on an alkaline substrate etc. • It may also be caused by the poor surface preparation. SOLUTION As prevention and in order to avoid the problem, the proper preparation of the surface to be painted and the avoidance of using products that are unsuitable for exterior use is highly recommended. The problem is solved by repainting the surface with high quality paints, suitable for exterior use and resistant to UV radiation.
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