Problems that are prone to occur in paint application and their solutions
The surface of the wall paint is bubbling
Characteristics: Many protrusions of uneven size and irregular shape appear on the surface.
Cause of occurrence
The moisture content of the base layer is too high and it has not been fully dried.
Apply the topcoat before the primer is dry.
When spraying, water vapor in the compressed air mixes with the coating.
Solution
The coating should be carried out only after the base layer is fully dry.
After the primer is completely dry, apply the topcoat.
Before spraying, check the oil-water separator to prevent water vapor from mixing.
For bubbled walls, wait until they are completely dry. Then, gently sand the bubbled areas with fine sandpaper and reapply the paint. For large areas of bubbles, they should be removed, wiped clean and repainted.
Wall hanging
Characteristics: The coating film partially droops, forming a tear-like or wavy shape.
Water-based industrial paint
Cause of occurrence
The construction surface is too smooth or uneven, and there is oil accumulation in the concave areas.
The paint was overly diluted with water and its viscosity was too low.
● The roller and brush were dipped in too much material, resulting in an overly thick paint film during one application.
During the spraying construction, the spraying pressure is uneven and the distance between the spray gun and the construction surface is inconsistent.
The drying speed of the paint is too slow.
Solution
Sand the surface of the wall with sandpaper to increase adhesion. If the base layer is uneven, it should be leveled as much as possible and the sharp corners should be ground off. When brushing, apply force evenly.
Improve the construction technique, apply the paint several times, and each application should be thin.
Add the dilution water in proportion to the concentration of the paint. Do not over-dilute it.
During the spraying process, adjust the air pressure to ensure uniform pressure. The distance between the spray nozzle and the surface to be coated should be adjusted to be sufficient to eliminate this defect, and it should be moved evenly.
Alkali efflorescence on the surface
Characteristics: Salt and alkali precipitation occurs on the surface of the paint film, forming white sagging on the surface or destroying the adhesion of the paint film.
Cause of occurrence
If the moisture, alkali or salt content in the base of the wall is too high, when water vapor evaporates, the salt and alkali will be carried out and precipitated on the bottom layer or surface of the paint film.
Poor waterproofing during civil construction allowed rainwater and moisture to seep into the base on the other side of the wall through cracks or unpainted base surfaces, and when they spread, they carried out salt and alkali.
Solution
Remove the powderized layer;
Choose the appropriate paint;
Follow the construction specifications and do not over-dilute.
When necessary, a suitable primer should be selected to seal the wall base, such as the Apollo Health Paint series.
Ensure that the construction environment meets the construction requirements.
For more industry information, please search for "Baodelong Art Coatings: Show More Care for Your Family".
The paint surface is cracked.
Characteristics: Linear, multi-angled or irregular cracks form on the paint film.
Cause of occurrence
If you apply it too thickly at one time, the surface will be dry while the inside will not.
The base of the wall is too loose (commonly seen with counterfeit and inferior brand putty on the market) or rough.
The temperature was too low during construction.
The paint system is incorrect, and the primer and topcoat do not match.
Solution
Remove the affected paint film.
Ensure that the paint film is not too thick in one application and strictly control it.
Make sure the previous coat of paint is completely dry before repainting.
When necessary, seal the wall base with an appropriate primer.
For the base of interior wall surfaces with high roughness, it is recommended to use products with good flexibility.
When the base temperature of the wall is below 5℃, wall latex paint should not be applied.
Choose the correct paint system.
If trowel is required, make sure that the putty is firm and solid after curing.
Mold and algae grow
Characteristics: There is grayish-black mold or green algae growing on the surface of the paint film, especially in the corners of the house or areas that are often damp.
Cause of occurrence
● Walls, especially those in damp areas, are conducive to the growth of mold or algae.
The wall paint used has poor anti-mold and anti-algae performance or inferior products were purchased
The construction surface is rough and porous, making it easy for impurities to accumulate and promote its growth.
Solution
Clean the areas with mold and algae with appropriate mold-killing water or bleach.
The exterior walls can be washed with high-pressure water guns. It is recommended that after manual scrubbing, they be cleaned with mold-removing water.
If the environment is particularly harsh, special formula paint should be used to appropriately enhance the anti-mold and anti-algae capabilities.
Wash thoroughly and dry in the air. Reapply the primer once to seal and apply the topcoat twice.
The best way is to prevent mold in advance: choose brand-name paints and avoid counterfeit and shoddy products. Ensure the quality of the putty is strictly controlled. The base must be completely dry before applying the coating.
For more industry information, please search for "Baodelong Art Coatings: Show More Care for Your Family".
Peeling and flaking
Characteristics: After the coating is applied, the paint film is damaged and peels off in large pieces or shows local peeling.
Cause of occurrence
The base of the wall is not cleaned properly. If there is grease or other substances present, the adhesion of the paint film will be poor.
The wall moisture is too high, the base moisture content is too high, or there is salt and alkali precipitation.
The bonding strength of the putty is too low, and the coating is applied too thickly each time.
The base of the wall is severely powderized or has not been dusted after grinding treatment.
The primer selected is not compatible with the wall base or is of poor quality.
Solution
Check the source of the moisture and repair it thoroughly.
Remove all the paint films that have been affected and lost their adhesion, clean the wall surface and wait until it is completely dry.
Select qualified putty. For interior walls, it is recommended to use water-resistant interior wall putty, while for exterior walls, it is suggested to use special putty. After the putty is applied, it should be cured until the alkalinity and moisture content meet the standards.
Ensure that the wall treated with putty is solid and firm, does not powderize or shed powder, and strictly control the thickness of each coat of paint.
Fill uneven surfaces with high-quality cement plastering and apply durable putty to faulty surfaces. After it is completely dry, sand it smooth with sandpaper.
Finally, when matching the primer with the topcoat, a primer with good adhesion and brand quality should be selected.
Characteristics: Many protrusions of uneven size and irregular shape appear on the surface.
Cause of occurrence
The moisture content of the base layer is too high and it has not been fully dried.
Apply the topcoat before the primer is dry.
When spraying, water vapor in the compressed air mixes with the coating.
Solution
The coating should be carried out only after the base layer is fully dry.
After the primer is completely dry, apply the topcoat.
Before spraying, check the oil-water separator to prevent water vapor from mixing.
For bubbled walls, wait until they are completely dry. Then, gently sand the bubbled areas with fine sandpaper and reapply the paint. For large areas of bubbles, they should be removed, wiped clean and repainted.
Wall hanging
Characteristics: The coating film partially droops, forming a tear-like or wavy shape.
Water-based industrial paint
Cause of occurrence
The construction surface is too smooth or uneven, and there is oil accumulation in the concave areas.
The paint was overly diluted with water and its viscosity was too low.
● The roller and brush were dipped in too much material, resulting in an overly thick paint film during one application.
During the spraying construction, the spraying pressure is uneven and the distance between the spray gun and the construction surface is inconsistent.
The drying speed of the paint is too slow.
Solution
Sand the surface of the wall with sandpaper to increase adhesion. If the base layer is uneven, it should be leveled as much as possible and the sharp corners should be ground off. When brushing, apply force evenly.
Improve the construction technique, apply the paint several times, and each application should be thin.
Add the dilution water in proportion to the concentration of the paint. Do not over-dilute it.
During the spraying process, adjust the air pressure to ensure uniform pressure. The distance between the spray nozzle and the surface to be coated should be adjusted to be sufficient to eliminate this defect, and it should be moved evenly.
Alkali efflorescence on the surface
Characteristics: Salt and alkali precipitation occurs on the surface of the paint film, forming white sagging on the surface or destroying the adhesion of the paint film.
Cause of occurrence
If the moisture, alkali or salt content in the base of the wall is too high, when water vapor evaporates, the salt and alkali will be carried out and precipitated on the bottom layer or surface of the paint film.
Poor waterproofing during civil construction allowed rainwater and moisture to seep into the base on the other side of the wall through cracks or unpainted base surfaces, and when they spread, they carried out salt and alkali.
Solution
Remove the powderized layer;
Choose the appropriate paint;
Follow the construction specifications and do not over-dilute.
When necessary, a suitable primer should be selected to seal the wall base, such as the Apollo Health Paint series.
Ensure that the construction environment meets the construction requirements.
For more industry information, please search for "Baodelong Art Coatings: Show More Care for Your Family".
The paint surface is cracked.
Characteristics: Linear, multi-angled or irregular cracks form on the paint film.
Cause of occurrence
If you apply it too thickly at one time, the surface will be dry while the inside will not.
The base of the wall is too loose (commonly seen with counterfeit and inferior brand putty on the market) or rough.
The temperature was too low during construction.
The paint system is incorrect, and the primer and topcoat do not match.
Solution
Remove the affected paint film.
Ensure that the paint film is not too thick in one application and strictly control it.
Make sure the previous coat of paint is completely dry before repainting.
When necessary, seal the wall base with an appropriate primer.
For the base of interior wall surfaces with high roughness, it is recommended to use products with good flexibility.
When the base temperature of the wall is below 5℃, wall latex paint should not be applied.
Choose the correct paint system.
If trowel is required, make sure that the putty is firm and solid after curing.
Mold and algae grow
Characteristics: There is grayish-black mold or green algae growing on the surface of the paint film, especially in the corners of the house or areas that are often damp.
Cause of occurrence
● Walls, especially those in damp areas, are conducive to the growth of mold or algae.
The wall paint used has poor anti-mold and anti-algae performance or inferior products were purchased
The construction surface is rough and porous, making it easy for impurities to accumulate and promote its growth.
Solution
Clean the areas with mold and algae with appropriate mold-killing water or bleach.
The exterior walls can be washed with high-pressure water guns. It is recommended that after manual scrubbing, they be cleaned with mold-removing water.
If the environment is particularly harsh, special formula paint should be used to appropriately enhance the anti-mold and anti-algae capabilities.
Wash thoroughly and dry in the air. Reapply the primer once to seal and apply the topcoat twice.
The best way is to prevent mold in advance: choose brand-name paints and avoid counterfeit and shoddy products. Ensure the quality of the putty is strictly controlled. The base must be completely dry before applying the coating.
For more industry information, please search for "Baodelong Art Coatings: Show More Care for Your Family".
Peeling and flaking
Characteristics: After the coating is applied, the paint film is damaged and peels off in large pieces or shows local peeling.
Cause of occurrence
The base of the wall is not cleaned properly. If there is grease or other substances present, the adhesion of the paint film will be poor.
The wall moisture is too high, the base moisture content is too high, or there is salt and alkali precipitation.
The bonding strength of the putty is too low, and the coating is applied too thickly each time.
The base of the wall is severely powderized or has not been dusted after grinding treatment.
The primer selected is not compatible with the wall base or is of poor quality.
Solution
Check the source of the moisture and repair it thoroughly.
Remove all the paint films that have been affected and lost their adhesion, clean the wall surface and wait until it is completely dry.
Select qualified putty. For interior walls, it is recommended to use water-resistant interior wall putty, while for exterior walls, it is suggested to use special putty. After the putty is applied, it should be cured until the alkalinity and moisture content meet the standards.
Ensure that the wall treated with putty is solid and firm, does not powderize or shed powder, and strictly control the thickness of each coat of paint.
Fill uneven surfaces with high-quality cement plastering and apply durable putty to faulty surfaces. After it is completely dry, sand it smooth with sandpaper.
Finally, when matching the primer with the topcoat, a primer with good adhesion and brand quality should be selected.