Regardless of the substrate on which the coating is applied, some professional painters are not aware of the importance of applying a suitable coating rate. This is because it is usually possible to apply the coating at a higher coating rate and also achieve a consistent appearance, especially when the color of the primer is similar to the color of the coating. For example, a painter may feel very good at applying 12 square meters per liter of paint, while also achieving a good appearance. However, if 10 square meters per liter of paint is the recommended coating rate for the paint manufacturer, then coating at a coating rate of 12 square meters per liter will result in a dry film thickness that is only recommended. 80% of the thickness.
No matter how beautiful the appearance, the thin dry film can adversely affect some of the key properties of the coating, and all of this performance will affect the final quality of the project. Performance quality is compromised to prevent mildew. Premium latex paints have better mildew resistance than economical latex paints because they usually contain more antifungal agents, one that inhibits mold growth.
However, if you paint the coating too thin, this benefit of the paint film is minimized because the thinner coating contains insufficient growth inhibiting additives. The thicker film not only provides the mold resistance of the coating, but also helps prevent the fungus from obtaining nutrients from the substrate. The negative effects of over-coating on the performance of the coating can also be manifested in a number of other ways, including: affecting crack resistance - the crack resistance of the coating is directly related to the thickness of the film after drying. This is especially important for the painting and refurbishing of outdoor wood. Poor hiding power - the coating does not completely cover the surface, so past colors or patterns appear through the paint film. This problem becomes apparent once the paint film is eroded due to weather or cleaning.
Poor cleaning - The necessary cleaning to remove dirt or stains may damage some of the paint film, especially on flat paint films. Therefore, the thinner paint film is less resistant to cleaning than the thick paint film formed from the same paint.
Poor fluidity and leveling - brushing and roll marks are evident on dry paint films. Applying a thick coating provides better flow and leveling. Final durability of outdoor painting projects - In the same situation, thin paint films are more susceptible to erosion than thick paint films. Consistency of gloss - too thin a paint film can compromise this important property. Primers are also affected by coatings that are not coated at the specified coating rate. The problems are not limited to paints, but primers are also affected. This is because coating the primer too broad can also result in a film that is too thin after drying, which in turn weakens its primary properties.
Regarding the primer, the main properties affected by the coating rate are: crack resistance, hiding power, mold resistance, consistency of topcoat gloss, and stain sealing and corrosion resistance depending on the nature of the primer.
So take some time to measure your painted surface to calculate its area. Then roughly determine the amount of paint, colorant, and/or primer needed to paint the entire area, in liters. Whether you apply it by spraying, roller coating or brushing, you should try to apply a sufficient amount of paint to the surface.
The recommended coating rate is determined by the condition (smoothness and porosity) of the surface to be coated and the particular coating used. For very rough exterior wall surfaces, such as rough concrete surfaces, the coating area per liter of paint can be approximately 3.6 to 5 square meters, while the smoother surfaces, such as closed concrete cast surfaces and primed Smooth wooden surface, 10 to 11 square meters per liter of paint.
Whether you are contracting indoor or outdoor work, always apply paint and primer at the manufacturer's recommended coating rate. This results in a thicker, more protective, and longer-lasting paint film.
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