Exterior wall paint construction the most common problem solution!
There will be a variety of problems in the construction process of exterior wall paint, the following to share with you the common problems and solutions in the construction process of exterior wall imitation stone paint.
01 Slow drying and readhesive
After coating, the film over the specified time is still not dry, become slow dry. If the film has been formed, but still has viscosity, called will stick.
Causes:
A. The paint film is too thick
B. Apply a second coat before the first coat dries
C. Improper use of dryers
D. The surface of the base is unclean
E. The base surface is not completely dry
Treatment method:
A. For minor phenomena, ventilation can be strengthened and temperature can be raised appropriately.
B. If the paint film is serious, wash it with strong solvent and spray it again.
02 Paint film into powder after brushing
Causes:
A. Poor weatherability of paint resin
B. The wall surface is poorly treated
C. The temperature of brushing is too low, resulting in poor film formation
D. Excessive dilution during brushing
The solution:
Clean up the powder first, and then use a good closing primer on the base, and then re-spray a good weatherproof stone imitation paint.
03 Discoloration and fading
Cause of occurrence
A. The humidity in the substrate is too high, and the water-soluble salt crystals on the surface of the wall cause discoloration and fading.
B. Inferior imitation stone paint is not made of natural color sand, and the base material is alkaline, which damages the pigment or resin with weak alkaline resistance.
C. Bad weather
D. Improper selection of paint materials
The Solution
If you see this phenomenon in the construction, you can first clean up the surface of the problem, let the cement completely dry, and then add a layer of closed primer, choose a good imitation stone paint.
Peeling and flaking
Cause of occurrence
Because the humidity of the base material is too high, the surface treatment is not clean, and the painting method is not correct or the use of inferior primer, will cause the paint film from the base surface.
The Solution
In this case, we should first check whether the wall leakage, if there is leakage, we should first solve the leakage problem. Then the paint and loose matter will be removed, repaired on the defective surface durable putty, and then closed primer primer.
05 Foaming
After the film dried, the surface appeared different sizes of bumps, and slightly elastic.
Cause of occurrence
A. The base is wet, and the evaporation of water causes the foam of the paint film
B. When spraying, there is water vapor in the compressed air, which is mixed with the paint
C. The primer is not dry, and the topcoat is applied in the rain. When the primer is dry, the gas produced will cause the topcoat to blister
Solution: slight film foaming, can be used to dry the film after sandpaper grinding credentials, and then fill the top paint: more serious film foaming, the film must be removed, to dry the base, according to the cause of foaming treatment, and then spray imitation stone paint.
