7 key points for paint construction, let you step by step --- the wall is clean and beautiful without cracking!
发布时间： 2019-07-06 11:29 Author: Polyurethane foam machine Source: http: //motokone.com
Published: 2019-07-06 11:29
1. Can exterior wall paint be used for interior walls?
The performance requirements of exterior wall coatings are higher than those of interior walls. Exterior wall coatings can be used for interior walls. Because the price of exterior wall paint is higher than interior wall paint, it is not generally used by consumers. However, sometimes when the interior wall coatings are more demanding or have special requirements, external wall coatings, such as bathrooms, toilets, and kitchens, can be used to make them more magnificent.
2. Generally, interior wall coatings are not used for exterior walls?
Water-based interior wall coatings are made of water, emulsion, pigments, fillers, metal powder, mica powder, additives and so on. Interior wall coatings are different from exterior wall coatings because they have different environmental resistance. Generally speaking, outdoor coatings need to have a certain resistance to wind, frost, rain, snow and sunshine (water resistance, alkali resistance, UV resistance, frost resistance, fade resistance, pollution resistance, etc.), so the raw materials selected in the formula Requires higher than interior wall paint. The environment experienced by general interior wall coatings is milder than that of exterior walls, so general interior wall coatings cannot be used for exterior walls.
3. Why is there any requirement on the humidity and curing period of the wall before painting?
The wall is wet. On the one hand, the moisture in the cement or mortar that has just been finished has not completely faded out; on the other hand, the environment is too wet or the rain has caused excessive humidity. An excessively wet wall surface will affect the adhesion of the paint surface, which will cause the paint surface to blister, crack, fade, and promote the growth of mold. And in the process of moisture evaporation and drying, the salt and alkali in the wall will ooze out and accumulate on the surface, which will damage the paint surface and make the color fade. Therefore, the humidity of the wall before construction is limited to 6% or less.
After the cement wall is formed and plastered, it should have a curing period of at least 28 days, so that the cement is completely solidified, the size is stable, and the alkali is oozed out and washed away before painting.
4. Why do we need surface treatment? What are the methods of surface treatment?
No matter how good the coating used, if the surface is not adequately and properly treated beforehand, the resulting coating surface will not be perfect in terms of performance and benefits. The surface treatment varies from substrate to substrate, but the purpose is the same: to give a dry and stable substrate.
Surface treatment methods: high-pressure water washing, sanding, temperature control, maintenance period of the substrate, shedding, pickling, solvent degreasing, sawing, sandblasting, repairing, etc.
5. Can high-viscosity water-based interior wall paint be sprayed directly?
Water-based interior wall paint with very high viscosity can be directly sprayed with airlessly without dilution or small dilution, and the effect is better. If you use air spray, the water-based interior wall coating must be diluted to the corresponding viscosity, because different spray guns, different air pressure, the required viscosity of the water-based interior wall coating is different. Water-based interior wall coatings require a large amount of spray paint and mist spray, and the spray spray must be large.
6. How to choose the painting tool? What should I pay attention to when using a new pencil and a new stiff brush?
According to the size, nature and paint material of the painted surface, different hard brushes and pens are used. Use a flat, hard-bristled brush for painting the primer and blending paint; use a flat-shaped brush with thinner bristles and better elasticity for applying the varnish; paint.
When using a new hard-bristle brush, place the hard-bristle brush on No. 1 sandpaper before sanding the paint, sand the head of the bristle back and forth, smooth the hair, and then dip a little paint on the old surface. Brush back and forth several times to make the floating hairs fall off, so as to ensure that the bristles do not fall off easily when brushing.
When using a new pen, in order to reduce the loss of hair, you should use your fingers to move back and forth before use to let the unsticky wool fall out, then soak it with hot water, flatten the pen tip, and wrap it with paper. Let it do it.
7. Why is it better to paint more than two times when applying water-based interior wall paint?
Water-based interior wall coatings are applied twice to achieve their proper hiding power and surface properties. Because the hiding power of the coating and the surface properties of the coating have a certain relationship with the thickness of the coating surface, in order to achieve added decorative and protective effects, water-based interior wall coatings are painted twice. The premise is that the construction is carried out in accordance with the substrate treatment and dilution rate required by the instructions.
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