The interval between two coats of paint must be sufficient to ensure that the second coat of paint can be applied after the first coat of paint film is completely dry.
Poor wall surface treatment.
2.
5.
Solution: 1.
2.
When pressed by hand, it will feel slightly elastic.
2.
Poor weather resistance of coating resin.
If the primer is not dry enough, the finish coat shall be applied in case of rain.
8、 Wrinkle: wrinkle caused by the undulation of the paint film: 1.
2.
The top coat shall be applied after the primer is completely dry.
The reason for lift off is that the primer is completely dry when brushing, and the diluent of the surface layer swells the lower primer, causing the paint film to shrink and peel.
The temperature is too low during brushing, resulting in poor film formation.
1、 Slow drying and tack back coating: when the paint film is not dry after the specified time, it is called slow drying.
2.
In order to increase the stability of lotion, low-grade or low-priced lotion with low quality will often add excessive surfactants, which will greatly reduce the water resistance of lotion itself.
The dilution ratio is too high.
The paint film is too thick at one time.
Causes: 1.
2.
Solution: if the paint film is slightly foamed, it can be polished with sandpaper after the paint film is dry, and then the top coat can be repaired; In case of serious blistering of the paint film, the paint film must be removed.
The paint film is too thick and the surface shrinks.
2.
3.
3.
Solution: in order to prevent this situation, avoid coating too thick and brush evenly.
The weather is bad.
Improper use of drying agent.
Solution: each construction step must be followed in the construction process to avoid the damage of cross pollution as much as possible.
The base layer is wet and the water evaporation causes the paint film to bubble.
11、 Phenomenon and main reasons of poor water resistance: some real stone lacquers will obviously turn white after being washed and soaked by rain, and return to the original state after the weather is clear, which is a direct manifestation of poor water resistance of real stone lacquers.
2、 Powdering: the paint film becomes powdery after coating.
6、 Lift off: lift off is also called undercutting.
4.
The humidity in the substrate is too high, and the water-soluble salt crystals cause discoloration and discoloration on the surface of the wall.
2.
The amount of lotion is too low, and the price of high-quality lotion is high.
If the paint film has been formed, but there is still a sticky z-finger phenomenon, it is called back adhesion.
If there is any leakage, solve the leakage problem first.
Apply the second coat of paint before the previous coat of paint is dry.
4.
Use sandpaper to polish the old paint surface of the object to be brushed.
2.
Too much water is mixed in the coating during brushing.
The coating shall not be applied too thick.
Improper material selection of coating.
IX.
Solution: carry out average dividing treatment, and carry out uniform mixing of mortar during plastering of foundation house.
At the same time, we can choose auxiliary coatings with anti-aging, high temperature resistance and strong radiation resistance to fill the gap, which can also ensure the reduction of cross pollution.
3.
3.
10、 The causes of a large number of uneven plastering lines: the large area of cement mortar causes slow drying time, which will lead to cracking and hollowing; Mt-217 bentonite is used in real stone paint, which is smooth and easy to be scraped.
Reduce the dilution ratio.
Solution: 1.
as thickeners when manufacturing genuine stone paint.
The main reasons are as follows: 1.
During spraying, there is water vapor in the compressed air, which is mixed with the coating.
VII.
2.
Solution: if this phenomenon is seen during construction, the surface with problems can be wiped or shoveled off first, and the cement can be completely air dried, then a layer of sealing primer can be applied, and a good stone paint can be selected.
The inferior genuine stone paint is not natural color sand, and the base material is alkaline, which infringes on the pigment or resin with weak alkali resistance.
In order to save costs, the manufacturer only adds a small proportion of lotion, which makes the paint film loose and not dense after drying, the water absorption of the paint film is relatively high, and the adhesive strength is correspondingly reduced.
For slight slow drying and back sticking, the ventilation can be strengthened and the temperature can be appropriately increased.
Then peel off the peeling paint and loose materials, apply durable putty on the defective surface, and then seal the primer for priming.
Apply a thin layer each time for multiple times.
The paint film is too thick.
When the primer is dry, gas will be generated to lift the finish coat.
serious cross pollution causes: the surface layer is not distributed on the grid during the construction process, resulting in the appearance rolling off.
Treatment methods: 1.
Paint directly on the old paint surface without polishing.
3.
The surface of base course is not completely dry.
These substances are water-soluble or hydrophilic, and remain in the coating after film formation, greatly reducing the water resistance of the coating.
The temperature is too high during drying.
The surface of base course is not clean.
3.
4、 Causes of peeling and peeling: due to the high humidity of the base material, the unclean surface treatment, the incorrect brushing method or the use of inferior primer, the paint film will be separated from the base surface.
The causes are as follows: 1.
After the base layer is dry, the cause of blistering shall be treated, and then the real stone paint shall be sprayed.
The paint film with slow drying or severe backtack shall be washed with strong solvent and re sprayed.
3、 Causes of discoloration and discoloration: 1.
Once a long period of rainy weather is encountered, the rain will permeate into the paint film, causing the stone paint to turn white.
Causes: 1.
1.
4.
Solution: in this case, check whether the wall is leaking.
Manufacturers with excessive thickener often add a large amount of carboxymethyl cellulose, hydroxyethyl cellulose, etc.
Solution to pulverization: clean up the pulverization first, then use the sealing primer with good performance for priming, and then re spray the real stone paint with good weather resistance.
3.
When applying the second layer of paint, the first layer is not dry.
Hanging on the construction site, it is often found that the paint is hanging or dripping from the wall, forming a tear like or wavy appearance, commonly known as tears.
5、 After the foamed paint film is dry, the surface will have bumps of different sizes.
Solution: the coating construction shall be carried out according to the specified time interval.
Selecting high-quality lotion requires the manufacturer to select high molecular acrylic polymer with excellent water resistance as the film-forming material to improve the water resistance of stone paint from the source..
