In-depth analysis of the cause and solution of wall coating shedding

The cause of wall paint shedding

1
sun exposure shedding discoloration
summer heat, for the lighting area is relatively large and in the air is not enough circulation of buildings and direct sunlight wall, the temperature is too high water-soluble salt crystallization on the surface of the wall caused discoloration and color shedding or even cracking, two to use air conditioning caused indoor and outdoor temperature difference, resulting in wall surface expansion or contraction, will also cause wall peeling.
corresponding method:
yang wall in the sun is more severe when the use of blackout cloth curtain barrier, and pay attention to the wall cooling and internal and external room temperature balance;
2
The wall is moisture peeled off
One situation is when the wall foundation is more humid, if not completely dry on the painting paint, the second is in the rainy plum rainy season air moisture caused the wall moisture, both are water seeping into the paint surface caused the paint film to lose adhesion, resulting in peeling off
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Response:
Avoid painting works when spring and summer humidity is high, if inevitably construction can be carried out using the spray gun method to speed up drying (it takes about seven days for the film to dry completely and achieve optimal results); Chemicals, apply glue on the wall to increase the adhesion of putty, so that according to the normal process of construction, pay attention to the wall after full drying and then carry out the next process, putty is best to use waterproof type, wall paint is best changed to elastic scrub."
3
construction paint improper color change
strong dry paint can not be in the paint at the same time construction, such as polyurethane paint products and paint at the same time construction, such paint contains TD1 ingredients will make latex paint color.
:
apply latex paint two days after the paint has been applied (25 degrees C), or after the latex paint has dried thoroughly (25 degrees C) and then brush the paint after 7 days.
4
The surface of the wall is mouldy
mild mold using mold-killing water, 84 disinfectants or bleach solutions (diluted to 5-10%) wipe clean painted walls; if the seepage cracking wall causes severe mold, sew along the cracks Clear the floating ash debris, fill the seams with sealing material after a large area along the wall painted waterproof paint twice, if the temperature difference reason, see if there is no insulation layer wall (knocking on the wall there is a hollow sound is there), no can be added, some words may be insulation material can not, replace to cure this.
5
dry paint when there is a flow hanging
painting and dry paint process vertical or bevel coating film may form a flow mark or lower edge thickening phenomenon, the simple remedy is to let the coating film completely dry solidified, with very fine sand paper wet grinding and polishing, Or to fine sandpaper wet grinding, and re-spray, to cure this mainly includes several aspects: the correct setting of the gun, the correct spray technology, applicable thinner, improve the temperature of the spray chamber, keep the spray surface clean, so it is recommended to use professional spray than DIY more secure.
What to do if the wall paint falls off
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1, remove the peeling part of the heavy scrape putty
White wall or bare wall local drumming or slightly cracked peeling, you can eliminate the problem place, and the edge of the removal part after grinding smooth, re-scraping putty, primer, and then brush again, but may be a little bit different from the original wall.
2, the grass-roots professional reinforcement treatment
for the local peeling more serious situation, it is necessary to consider whether the wall substrate is not done at all. The original wall is removed to the wall base, with interface agent or sealing primer repainted again, and then in accordance with the whitewash plaster to find flat, mesh cloth (reinforced anti-cracking), batch scraping wall lining three times after polishing flat, the whole grass quality will be much better at this time.
3, direct roll brush paint cover local
If it is a simple color drop, it is generally recommended to take the way of rolling brush, covering a new round of primer and similar paint can be, but before construction, you need to judge the quality of the putty layer of the wall at this time: choose the wall The worst piece of color is wet with water after using a shovel to produce a shovel, if no powdering or shedding now (indicating that the original putty layer quality is better), can be directly polished with fine sandpaper flat treatment clean after brushing a new primer and finish paint can be.
4, the demolition of the old wall comprehensive construction refresh
comprehensive construction is equal to redecoration, the project volume is the largest, applicable to the existence of many cracking, peeling, powdering phenomenon of the wall. First of all, the wall to be completely eliminated to the cement layer, if some of the living age (such as before the 1980s) more than the decoration of the house, but also need to be removed to the brick wall surface, and then a comprehensive construction of the refurbished wall: flat wall - solidified grass - brush interface agent - batch scraped three times water-resistant putty - wall polishing - over the primer - the last two effect paint.
Everyone in the choice of wall paint, as far as possible to choose some quality assurance brand wall paint, because the quality of wall paint is good, shedding phenomenon will be very few, and after-sales service is also particularly perfect, even if everyone in the use of the process of shedding problems, you can also find after-sales service repair or replacement.
also in the use of wall paint to decorate the wall, remember to use the appropriate construction process and methods.