Do I need to paint the walls? Don't brush the paint if it's of good quality?

There are differences between the regions on the issue of brushing walls without primers.
"I've never used
primer before, and I'm sure it
's going to be okay."
"
must brush primer
, otherwise there must be all kinds of wall problems
China
."
both cases exist, and both sides are insoquest. A large part of the reason for this disagreement stems from the experience of local teachers.
primer what with
latex paint into the country, there was no primer paint, are scraped white directly on latex paint. Later gradually improved on the process, with the primer this layer transition.
Its role is:
(1)
strengthen putty and paint
adhesion
, it can penetrate into the base of the capillary hole inside, the formation of claw-shaped deep embedded in the grass, and the grass to form a solid adhesion, while the paint can be closely combined, play a role in carrying the upper and lower;(2) closed the base of the capillary hole
, to prevent the alkali in the cement penetration, resulting in paint hair flowers (commonly referred to as pan-alkali), primer can also reduce the use of paint.(3) provides a certain amount of
.
(that is, it looks whiter and covers the underlying color)
the difference between primer and putty
Putty powder is to find flat walls, isolate the weak alkalinity of cement, and provide good conditions for painting.
role of the primer is to isolate the putty layer and improve the adhesion and life of the paint.
The proportion of water added below varies from brand to brand
specific reference brand description is based on
primer dosing
5L of primer, brush again, the theoretical brush area of 60 to 70m2 (13 to 14m2 per litre), the specific total calculation can refer to the table below. (The following 1 set means 1 barrel primer and 2 barrels of paint)
the main reason for the disagreement
According to Xingge and the local decoration practitioners exchange, found that the main watershed with the use of primer is:
whether the local climate is dry all year round.
Semen, Shaanxi, Beijing and other relatively inland areas, year-on-year dry climate of the city, this climate conditions, the probability of this by the return of mold corrosion paint is relatively small (waterproof did not do a good job of water seepage does not count), so many masters directly brush the paint, no effort to give you a brush primer, but also patted your chest to ensure that you have done so many years no problem.
the southern coastal areas of the year-on-year humidity is relatively large, like now in March and May, more annoying "back to the south days." Brush primers are standard. If you do not brush the primer, it is easy to appear moldy, re-alkali problems (of course, in some cases if you do not pay attention to moisture, or construction problems, even if you brush the primer, will mold back alkali).
about the construction of viscose (latex paint, putty, tiles, carpentry, etc.), we must avoid this abominable back to the south, otherwise high humidity will seriously affect the quality of the finished product. Therefore, there are back to the south of the city in February to April is not the peak season for decoration, often because of wet work stopped.
topic click into the
wet weather suitable for decoration?
conclusion
the final conclusion is of course: brush primer is certainly better than not brushing.
on the market of large-name primer prices are not more than 200 / barrel, 100 flat building area of the house is also 3 to 4 barrels, this hidden project more than
spent
hundreds of dollars is worth it. The key lies in how to communicate with the master, because some master used to paint only, more than one process is certainly not happy,
in the final analysis is the problem of work money.