Exterior Paint Practices Precautions

Exterior wall coatings are different from interior wall coatings because the interior walls do not need to have anti-sun functions. Among various coatings, exterior wall coatings are usually made of high elasticity silicone acrylic emulsion and titanium white powder additives. In addition to the high performance of conventional high-grade exterior latex paints, the coating must be given a continuous decoration. Sex and waterproof features. The following Xiaobian introduces the precautions for the practice of exterior paint .

External Wall Coating Practice 1: Short Base Age

The coating of emulsion coating has certain permeability and alkali resistance. It can be applied under the condition that the base layer is not dried out. However, the age of concrete and mortar base should be 28 days and more than 7 days, otherwise it will be due to the age of the grass roots. Too short, high water content, large alkalinity, and poor adhesion to the remainder cause peeling off. Solvent-based coatings have poor air permeability and hydrophobicity. If they are applied on a wet base, they can easily peel off and fall off. Progress is made to shorten the age of the grass roots.

  

Practice of Exterior Coatings: Requirements for Finishing

The finish is uneven, there are obvious joints or there are differences between smooth and matte. After spray and brush coating, under the influence of light and shade, different colors will be produced to form a “flower face”. Therefore, in the front of the paint decoration, the surface has a loose, sanding, powdering phenomenon, should be cleaned with a wire brush in advance, the cellular hole scraping cement latex putty filling. The surface of the mortar base was calendered with an iron trowel, and then the water was used to brush out a small pockmark.

Exterior wall paint practice three: pollution treatment

If there is oil, rust, release agent and other substances on the surface of the grass-roots base, after spraying or painting the paint, it will produce a phenomenon of returning color and turning yellow. Therefore, first of all, the floating sand and dirt on the surface of the base layer should be removed. When there are oil stains, rust, and mold release agents, they should be cleaned with detergent. If the base mortar needs to be added with additives such as accelerators and antifreezes, care must be taken to choose a product with high solubility in water and less precipitated substances, in order to prevent the coating from flaking or producing different colors due to too much alkali precipitated.

Exterior wall paint practice four: low construction temperature requirements

All kinds of coatings need to be formed under a certain temperature conditions to form a continuous film, such as below the minimum temperature, because the coating film is not good, it will lead to cracking and chalking of the coating, affecting its life. Therefore, we must strictly control the minimum allowable temperature of various coatings, solution-type coatings generally can be operated above 0 °C, but the hot days due to solvent evaporation too fast and not suitable for construction, rainy days fear that the film is not formed before the rain should not be broken Construction, emulsion paint can be selected with different varieties, generally used between 8 °C and 15 °C.

Exterior wall paint practice 5: The consequences of misuse of putty

If there are holes in the grass-roots area, uneven parts should be covered with suitable putty. With a solvent-based coating, a varnish can be used as a primer with a lacquer or talc powder or a large white powder with a suitable consistency. When using emulsion-type paints, putty should not be used with low strength and poor water resistance such as cellulose. Otherwise, the coating may be thrown together with putty. The 107-glue, white latex cement or equivalent putty must be used.

  

Exterior wall paint practice six: add water and color should pay attention

Coatings need to have a suitable consistency during construction. Some constructors do not mix evenly, and when they see a large consistency, they add water at random, often with different shades of color and powder and empty drums. Therefore, the paint must be fully stirred before use. If it is necessary to add water, it shall be constructed according to the factory instructions, and no water shall be added. Some operators add color to the paint, blindly purchase pigments from the market, and add color to the paint. Although the color meets the requirements during construction, due to unauthorized coloration, certain chemical components in the paint are destroyed, resulting in poor color and poor color retention.

Exterior Paint Practice #7: Incorrect Spraying

When spraying, it should be sprayed evenly, and no leakage, spurious or slurry flow can be used. When brush or roller coating is applied, the length of brush and roller should be the same. Spray paint should not be too thick. If it is sprayed twice, it should be fully dried in the first pass and then performed a second time. Roller type cold material two times interval is 24 hours, operation should not be repeated brushing. When using the emulsion type coating, a 1:3 dilution of 107 glue or other similar emulsion water can be fully brushed on the base layer to reduce the isolation of the dust and increase the adhesion of the coating to the base layer. The joints of the paint must be at the seam or at the corner of the yin and yang, and can't be arbitrarily left.

Editor's summary: The considerations for the practice of exterior paint are introduced here. For more information, you can follow this site information.

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