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| Causes and solutions of interior and exterior wall coating problems (three) |
Weathering / long spot: moisture from seeping in mortar or masonry, with a white salt like hard substance phenomenon.
Possible causes:
First, the surface pretreatment is not sufficient, there is no removal of the original on the surface of the weathering.
Two, excessive moisture from the internal masonry wall shed.
Solution: if the cause is excessive moisture, we must do by fixing the roof, gutters and downspouts cleaning, and water quality of pure acrylic or silicone acrylic sealant repair masonry crack method to remove moisture from the source.
If internal moisture from buildings, especially in the kitchen, bathroom and laundry, it is necessary to consider the establishment of the ventilation or exhaust fan is installed. Use wire brush, electric brush or dynamic cleaning to remove weathered material and all loose material, and rinse thoroughly with water.
Then high quality coating Waterborne or solvent type masonry sealing paint and let it dry completely; then coating a high quality exterior wall coatings, masonry paint or elastic wall paint.
Fade / poor color retention: early film and / or excessive color fades, this phenomenon usually appears in the South oriented, sunny exposure on the surface.
Solution method:
A painting in the paint color, vinyl wainscot than wall color light. White, beige, soft colors and other light color is a very good choice. High quality 100% pure acrylic latex paint is the best paint used on the vinyl wall, because the film has good flexibility and can withstand the expansion cycle due to the change of outdoor temperature.
Two, has bent or tilted panel by panel or home improvement company to do the assessment, to determine a correction method of the best. The wall may have to be replaced.
The wax infiltration from for wax exudation of reclaimed wood in the formation of hard wall stains. When the substrate is coated, the contamination will seep out from the paint film; they can even penetrate some ordinary primer, which may result in the accumulation of dust, mildew and / or poor adhesion (see dust and long mold).
Possible causes:
First, before coating finish, not as hard on the wall of the appropriate primer.
Two, before painting, hard wall has been exposed to wind and rain.
Solution: the prevention and treatment of the method is, the first 100% pure acrylic latex paint coating.
Then the coating quality 100% pure acrylic latex paint. The hard wall Association of the United States recommends coating two high quality 100% pure acrylic latex paint to achieve the best results. Some of the plates in the factory before the primer, just re painting the quality of paint on it. Poor quality, high pigment plain paint more easily than high quality coating occurred in the wax infiltration.
Wrinkling: when the paint to form a "skin" layer, the film surface becomes rough, there are wrinkles.
Possible causes:
One, the coating is too thick (in the use of alkyd or oily paint more prone to this situation).
Two, coating surface is too hot or too hot.
Three, the curing of the coating is exposed to rain, dew, fog or high humidity environment.
Four, in the first coating is not fully dry when coating finish.
Five, coating on the surface of the contaminated (such as dust or wax).
Solution: scrape or polish the surface to remove the wrinkling of the coating. Heavily coated with a layer of smooth quality exterior paint.
Before coating finish, in order to ensure the primer or first coating has dried. According to the coating paint manufacturers provide the rate of coating (coating two channel according to the spreading rate of a thick paint). When the weather is too hot, too cold or too wet, allow enough time to allow the coating to completely dry. External wall insulation is the most effective way to achieve the most effective building energy saving, as the application of the exterior wall facing material, building paint is the first choice. According to national jg149-2003 "expansion polyphenyl plate thin plastering exterior wall insulation system" provisions of the coating must be and thin plastering exterior insulation system has good compatibility and performance. |
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