148 Repair & Renovation Guide Problems with painted surfaces 7.5 Peeling paint POSSIBLE CAUSES • The paint application (final coat) was done with either too thick or very diluted paint (was not diluted according to instructions). • An unsuitable thinner (dilution medium) was used. • The surface was either not primed or primed with undiluted primer that has formed a skin. • The surface is not cleaned from dust or oils. • The plaster/render did not fully cure. SOLUTION To avoid this problem, allow time for adequate drying of the surface between successive coats of paint. Use the appropriate thinner for the type of paint chosen and follow the instructions of proper dilution. If the damage is already done, remove the entire coat of the peeling paint, skim, sand, clean, prime and repaint. 7.6 Paint ‘runs/drips’ and creation of uneven surfaces on the finished, painted surface POSSIBLE CAUSES This most likely happen from applying too thick of a coat of paint or by using inappropriate thinner for the type of paint used. SOLUTION To avoid the problem, use the appropriate thinner at the recommended thinning ratio. If the problem already exists on a surface that is dry, sand well to eliminate «run or drip» marks and abnormalities of the painted surface and skim, sand, clean, prime then repaint. 7.7 Brush or roller (lap) marks from applying paint with a brush or roller POSSIBLE CAUSES • The paint was applied with poor quality brush or roller. • Improper paint dilution or use of unsuitable thinner (dilution medium) for the type of paint used. • Bad application of paint. SOLUTION To avoid this problem, always dilute the paint according to the instructions, as specified on the container, and with the proper thinner. If the surface is dry, sand it to remove the marks, making sure that the surface is even. Clean the sanded surface properly and then proceed to repainting it by using the correct practices diligently. 7.8 Yellowing paint on a painted surface POSSIBLE CAUSES • Non-existent or insufficient natural light in the area where the painted surface is located. Especially true for enamel paints. However, the opposite is also true. • The painted surface is subjected to very strong sunlight for long periods of time. SOLUTION To avoid this problem, use very good quality paint with resistance to yellowing and that should be clearly stated in its properties. Improve, (if possible), the natural lighting of the space that the painted surfaces are located in, and also take care of the proper space ventilation. If the painted surface has already turned yellow, to the point that its image is no longer satisfactory, then clean the surface, prepare it properly, and then repaint it by choosing the appropriate paint this time.
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