If you rush to apply the next layer of paint at this time, it may cause more problems, such as the risk of mold, peeling, delamination, blisters, sagging, etc.
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The arrival of a strong wind brings cold air, which lowers the temperature and humidity of the air.
When the paint is applied under normal ambient temperature and humidity, the true drying time of the paint film is more than 3 days.
The drying and film forming process is even longer.
Therefore, after the last layer of putty is dried, polishing personnel must be arranged to follow up and select suitable sandpaper to immediately polish it.
It is difficult to achieve the ideal construction state in wet weather and humid environment.
Generally, it is not recommended to apply stone like coatings and exterior wall products during this period or in cold weather below 10 degrees Celsius (including specific construction time and the key curing period after 3 days of coating application), as the slow drying time of the paint film can affect the film forming quality and easily cause various quality problems.
How can we avoid it? Construction suggestions: ① In northern areas, when the minimum temperature is between 5-10 ℃, paint construction should be carried out from 10 a.m.
There is a scene of wetness everywhere, and the air seems to be able to wring water out.
⑥ Protect finished and semi-finished products.
Thick fog is the most characteristic representation of wet weather.
② Pay close attention to weather changes and stop construction in rainy days.
as much as possible, as too low a temperature can cause cracking of the paint film.
The exterior wall putty adopts a winter formula, with a relatively fast drying rate.
After rain, the moisture content of the substrate shall be tested, and the coating construction can only be carried out after reaching the standard to avoid blistering of the paint film Frequently test the surface temperature and relative humidity of the substrate, and stop construction when the substrate temperature is less than 5 ℃ or the relative humidity of the air is higher than 85% When the relative humidity of the environment is high, the drying and film formation of water-based coatings are relatively slow, and the repainting interval of the coating should be appropriately extended.
Generally speaking, after April and May, the phenomenon of frequent north south gales can improve.
Generally, only one coat can be applied a day.
Each thin batch should be controlled below 1mm (the next layer should be constructed before the previous layer is dry, which can easily lead to blistering and peeling of the coating).
Putty construction is only recommended in wet weather.
This is related to the humid air in the south, which is close to the sea.
Thin coated products are generally repainted every other day, while thick coatings such as elastic intermediate coat paint, relief bone paste, texture paint, and real stone paint are generally repainted every more than 2 days During the drying period of the base surface, if it rains, necessary shielding measures should be taken.
Construction suggestions: 1.
Site management: It is necessary for the project engineer, supervisor, and responsible person of each construction unit to strengthen construction management to ensure that the working surface is dry and avoid the situation of proceeding to the next process before the previous process is dry.
Do not be mistaken for the feeling of dry fingers on the surface that the paint is dry.
The humid weather in the southern region is a common phenomenon in Guangdong, Guangxi, Fujian, Hainan, and other regions.
If painting is required to be carried out in order to meet the construction schedule, we must pay attention to the coating repainting interval, which should be increased and extended (the repainting interval is about 4 hours under normal humidity and temperature).
In wet weather, the hardening speed of water resistant putty can be much faster.
By the way, take a look at the construction precautions in the northern region.
Every year, March and April are frequent periods of sand and dust weather.
The main component of water resistant putty is cement, which will harden when exposed to water.
If the humidity continues, the coating will always be in a wet state, so 3 days is a critical period, and we must ensure that the paint has sufficient curing time.
In spring, with the temperature rising, if the precipitation is relatively low and the ground is dry, when strong winds come, it is very easy to have sand and dust weather.
3.
All high-end film forming, waterproof, stain resistant, and weather resistant coatings have requirements for temperature and humidity during construction.
When wet weather occurs, the air humidity is close to saturation, and walls and even the ground will “emit water”.
in the later stage.
2.
In wet weather, the ambient temperature is mostly around 10 ℃, and the ambient humidity is above 85%.
In case of rain or dust weather, necessary shielding measures should also be taken.
The northern region is characterized by alternating north and south strong winds with strong winds.
The interval from the completion of putty batch scraping to polishing should not exceed 48 hours, to prevent the putty from hardening faster in wet environments, resulting in grinding difficulties.
to 16 p.m.
In fact, the moisture inside the paint film cannot be released.
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