Common Questions About Coating Construction
Release time:
2019-11-09
Source:
No.1
Can exterior wall paint be used for interior walls?
The performance requirements for exterior wall paint are higher than those for interior wall paint, but exterior wall paint can be used for interior walls.
Because exterior wall paint is generally more expensive than interior wall paint, consumers rarely choose it. However, sometimes when the requirements for interior wall paint are strict or have special needs, exterior wall paint can be used, such as in bathrooms, toilets, kitchens, etc., to achieve better results.
No.2
Is interior wall paint generally not used for exterior walls?
Water-based interior wall paint is generally composed of water, emulsion, pigments, metal powder, mica powder, additives, etc., and the main difference from exterior wall paint is their resistance to environmental factors.
Outdoor paint needs to have certain resistance to wind, frost, rain, snow, and sunlight (water resistance, alkali resistance, UV resistance, freeze resistance, fade resistance, pollution resistance, etc.), and the requirements for the raw materials selected in the formulation are higher than those for interior wall paint.
The environment that general interior wall paint can withstand is milder than that of exterior walls, so general interior wall paint cannot be used for exterior walls.
No.3
Are there requirements for wall moisture before painting?
If the wall is wet, it may be because the moisture in the freshly applied cement or mortar has not completely evaporated, or due to excessive humidity or rain. A wet wall can affect the adhesion of the paint surface, causing bubbling, cracking, fading, and promoting mold growth.
During the evaporation and drying process, the salts and alkalis in the wall can seep out and accumulate on the surface, damaging the paint surface and causing fading.
After the cement wall is formed and the mortar is applied, there should be at least a 28-day curing period to allow the cement to fully cure and stabilize, allowing the wall alkali to seep out and be cleaned before painting.
No.4
Why is surface treatment necessary?
No matter how high-quality the paint used, if there is not enough and appropriate surface treatment beforehand, the resulting paint surface will not be perfect in performance and effect. Surface treatment varies depending on the substrate, but the goal is the same, which is to create a dry and stable substrate.
Methods of surface treatment: high-pressure water washing, sanding, temperature control, maintenance period requirements for the substrate, removal of loose material, acid washing, solvent degreasing, sawing, sandblasting, patching, etc.
No.5
Can water-based interior wall paint be sprayed directly?
High-viscosity water-based interior wall paint, if not diluted or only slightly diluted, can be sprayed directly using airless spray, and the effect is better. If using air spray, the water-based interior wall paint must be diluted to the appropriate viscosity, as different spray guns and air pressures correspond to different viscosities of water-based interior wall paint.
No.6
Is it necessary to apply more than two coats?
Applying two coats of water-based interior wall paint is mainly to achieve the desired coverage and surface performance of the paint. Since the coverage and surface performance of the paint are related to the thickness of the paint surface, to achieve a good decorative and protective effect, water-based interior wall paint should be applied in two coats. The premise is to follow the substrate treatment and dilution rate requirements in the instructions.
The interval time between two coats should be determined based on specific construction conditions. Mainly, the second coat should be applied after the first coat is completely dry. Some paints may take longer to dry on the surface, extending the re-coating time.
No.7
How long after applying putty can painting begin?
There are many types of putty suitable for building walls, mainly water-based putty and nitro putty. If it is water-based putty, painting should be done after 24 hours; if it is nitro putty, painting should be done after 5 hours. The specific timing should depend on the drying progress of the putty; otherwise, the paint surface may easily bubble or peel.
No.8
Does not applying a primer on old walls have any impact?
If the old wall is relatively solid and the wall alkali is not severe, the surface can be cleaned and then directly painted with the topcoat.
If the paint surface is loose, and the surface is uneven after scraping, it is necessary to reapply putty and use a primer to ensure the quality of the topcoat.
RELATED INFORMATION
FUJIAN HUIXING COATINGS TECHNOLOGY DEVELOPMENT CO., LTD
TEL /400-995-8827
Address: Quanhui Petrochemical Park, Fujian Province
Website: www.fjhuixing.cn
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