Paint common sense: how to solve 12 misunderstandings of latex paint?

Core tips: mistake 1: touch with white powder paint and have quality problems After finishing painting the wall surface, use your hands to touch the white powder You don't need to be nervous Most of the "powder" dropped is the dust on the wall surface In the process of construction, a lot of dust will slowly attach to the wall, and similar phenomenon of powder falling may occur after touching with hands Use a duster or clean towel to wipe off the dust, which should be solved If the quality of latex paint is relatively poor, the moisture content is too much, and the emulsion is less After one or two years of painting, there may be a phenomenon of using the towel to remove the powder Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Paint Home News: error 1: touch the wall with white powder paint quality problems and finish painting, touch the white powder with your hands, you don't need to be nervous, most of the "powder" dropped is dust on the wall In the process of construction, a lot of dust will slowly attach to the wall, and similar phenomenon of powder falling may occur after touching with hands Use a duster or clean towel to wipe off the dust, which should be solved If the quality of latex paint is relatively poor, the moisture content is too much, and the emulsion is less After a year or two of the paint, it may appear that the dust is removed with the towel, but even if it is painted, it will not be dropped by hand Special reminder: latex paint is best applied to the wall for 24 hours and then touched by hand If the construction temperature is below 5 ℃, the time should be extended to one week Before buying latex paint, it's better to ask the merchants about the grade of latex paint In general, medium and high-grade paint won't lose powder, but the paint with lower grade has poor scratch resistance and is more likely to lose powder Myth 2: the smoother the finished wall is, the better the emulsion paint construction will generally adopt two processes of roll coating and machine spraying, and roll coating process is most commonly used in northern areas For the wall constructed by spraying, the smoother the surface is, the better, but not for roll coating The wall with roller coating will normally have knurled marks If the wall looks very smooth after roller coating, it is actually caused by too much water in the paint Too much water in the paint will reduce the adhesion of the paint and easily lead to paint dropping At the same time, too much water will reduce the content of the paint and the paint film on the surface is relatively thin, so the wall cannot be well protected, and the elasticity of the paint will be reduced, and it is difficult to cover the small cracks of the putty layer Special reminder: for the emulsion paint wall surface treated by roll coating process, do not pursue the effect of very smooth surface It is recommended to use short and medium wool roll to construct, so that the roll printing of the wall surface will look more meticulous, as long as the roll printing looks more uniform, it is in line with the requirements Mistake 3: light color latex paint can not cover dark color paint well no matter what color paint is used, it can cover dark color paint well (such as red, purple, etc.) But the covering power of dark paint is not strong, so it is better to use dark paint to cover dark paint than to use light paint to cover dark paint for several times Special reminder: cover dark paint with light paint, one or two times more than normal paint Error 4: the more times the dark latex paint is applied, the darker the color is The experimental results show that even if the dark paint is applied more than ten times, the wall color will not become deeper Because of the low content of titanium dioxide and the weak coverage, dark paint needs more times than light paint in the construction process, and the thick film is more uniform Special reminder: light paint can be applied twice, but dark paint is better to be applied more than four times Myth 5: primer is not very useful, you can also as long as the walls are scraped with putty, you must brush primer, even if the old walls are renovated, the parts scraped with putty must also brush primer Because the putty used now is water-resistant putty, which is more alkaline The primer has the effect of alkali resistance If you do not brush the primer, the putty will return to alkali, and the wall will become flower Special reminder: less water shall be added to the primer, and the interval between the primer and the subsequent finishing coat shall not be too short (preferably not less than 24 hours), otherwise, the putty may return to alkali after the primer is applied Error 6: no water in the emulsion paint, roller will not roll off any emulsion paint without water, roller can be brushed off, but the knurled mark left is large Because of the poor coverage of dark paint, if you add water when rolling, it is very easy to brush the wall, so dark paint is generally not watered For walls of the same area, the amount of roll painting with dark paint is at least twice that with light paint Special reminder: if you feel that the knurled mark on the wall surface is relatively large without water, you can use spray painting Mistake 7: the thickness of the coating film of spraying method is thinner than that of roll coating, which depends on the number of times of construction and the amount of water added, and has no direct connection with spraying or roll coating method Special note: at present, spray painting can be divided into air spraying and high-pressure airless spraying Under the same spraying times, the film of air spraying is thinner than roll coating, while the film of high-pressure airless spraying is thicker than brush coating Mistake 8: the more expensive the emulsion paint is, the better the effect is The wall effect after the construction of the emulsion paint is good Under the double influence of the quality of the emulsion paint and the construction technology, "good horse" also needs to be equipped with "good saddle" to play the maximum effect The higher the grade, the higher the content of paint, emulsion and other raw materials, the higher the requirements for the construction process If the construction process does not pay attention, it is more prone to the phenomenon of wall brushes Special reminder: before the construction, the construction personnel must be strictly in accordance with the construction requirements in the product description, especially pay attention to the three requirements of water quantity, base treatment and interval time indicated in the product description Mistake 9: paint too many times, and the paint will fall off The experimental results show that the latex paint with good quality will not fall off even if it is painted 10 times or 20 times Paint dropping is usually caused by damp and loose putty In this case, even one or two coats of paint will drop Special reminder: the common wall can be painted with one primer and two finishing coats, while the dark paint needs to be painted several times Myth 10: qualified latex paint is the judgment of environmental protection whether the latex paint is qualified or not is not the same as the national standard used for environmental protection Only latex paint passing the national green ten ring certification is the real environmental protection product Special reminder: only latex paint products that have passed the green ten ring certification will have corresponding labels on their surfaces, and consumers can check whether they have such labels when they buy them At the same time, you can also ask the merchants for the test report presented by the National Paint Quality Supervision and inspection center, and check the VOC (volatile organic compounds) and other indicators The lower the value is, the more safe and environmentally friendly products are China's environmental mark certification standard requires that the VOC content of wall paint after water removal should be ≤ 80g / L Myth 11: the visual effect is not consistent with the color card, because the manufacturer has adjusted the wrong color At present, the color matching of latex paint is computer color matching, so the possibility of error is very small The color we see on the color card is usually different from the actual color after the emulsion paint is applied to the wall After the four walls of the room are painted, the color of the wall paint will look darker than that on the color card due to the reflection of light and other reasons Special reminder: if you don't like the dark wall, you'd better choose a lighter color number when you choose the color in the color card If you like the dark wall, you can match the color of the selected color card Myth 12: high scrubbing times index the number of times that latex paint can be scrubbed by towel at will is the result of wiping on the paint surface with a special machine brush, rather than the result of testing with the tool of towel If the towel is rubbed as hard as clothes, the paint film may be scratched, and even the latex paint with a high number of scrubbing resistance may also be powdered Special reminder: if there is a stain on the wall, wipe it off in time with a wet towel with normal strength, and the paint with poor quality may penetrate for too long, which is not easy to remove Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,