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Why Coating Systems Fail
Many factors influence the life and performance of coating systems. Recognizing the exposure conditions and specifying the proper coatings is the first step in obtaining satisfactory coating performance. Specifying adequate surface preparation and coatings, combined with on-the-job inspection during preparation and application, serve to assure the best possible coatings performance.
Broadly defined problems which cause deterioration fall into one or more of the following categories. The environment of the proposed project should be examined to assess the presence of these either separately or in combination.
- Heat
Heat can cause coatings to discolor, blister and burn off. Specially formulated finishes should be specified for substrates exposed to elevated temperatures.
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- Moisture
This problem may include exposure to steam, humidity, condensation or actual immersion in water. For surfaces subject to the various types of moisture, it is essential that a coating be used that will adhere to moist surfaces, cure normally under these conditions and repel moisture to protect the surface.
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- Impact
Concrete will wear and can crack and chip. These problems require special coatings. Similarly, metal and wood surface subject to impact require the protection of unusually tough and flexible coatings.
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- Abrasion
All surfaces in high traffic areas are subject to damage from abrasion. In the case of masonry block, filling followed by glazing upgrades wall appearance and provides excellent resistance to abrasion as well.
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- Atmospheric Corrosion
Constant exposure to the elements – rain, heat, temperature changes and the ultraviolet rays of the sun may wear away a protective coating. For a coating to work effectively, it must be tough enough to resist the elements and be flexible enough to expand and contract with the surface to which it is applied.
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- Chemical Corrosion
Acids and alkalies will attack and destroy ordinary protective coatings. Chemicals and their concentrations must be accurately identified so that the proper coating system required for effective protection can be utilized.
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