Coatings and paints: a comprehensive analysis of common problems and a guide to usage techniques

1、 Do you really understand the difference between paint and coating?

Many people confuse the concepts of "paint" and "coating", but in fact, there are differences in their composition and application:

Coatings: Broadly speaking, they refer to all materials applied to the surface of objects, including water-based coatings, powder coatings, etc., with more environmentally friendly ingredients and a wider range of applications.

Paint: Traditional solvent based coatings use oil-based resins as the base material and require the use of diluents. They have a high content of volatile organic compounds (VOCs) and poor environmental friendliness.

Suggestion: Water based coatings should be prioritized for home decoration, and the industrial sector can consider them comprehensively according to their needs.

2、 Common question: Why does the coating crack or peel off?

Improper handling at the grassroots level

The grassroots has not been cleaned thoroughly, and there are oil stains, floating dust, or loose particles present.

Brushing without thorough drying after repair resulted in insufficient adhesion.

Solution: Before construction, use sandpaper to polish the base layer to ensure it is flat, dry, and free of debris.

environmental factor

Coatings are difficult to form films when applied in environments with low temperatures (<5 ℃) or high humidity (>85%).

Solution: Refer to the product manual for construction under suitable temperature and humidity conditions, and use dehumidification equipment if necessary.

Paint quality issues

Poor quality coatings have poor weather resistance and are prone to aging and cracking.

Solution: Choose legitimate channels for purchase and pay attention to indicators such as water resistance and scrub resistance in the testing report.

3、 Usage tips: How to improve the coating application effect?

Tool selection and matching

Roller: Suitable for large-area painting, the length of the fluff affects the thickness of the coating (short hairs are finer).

Brush: Used for handling details such as corners and gaps.

Spray gun: requires professional operation and is suitable for uniform spraying over a large area.

Layered construction

First, apply primer to enhance adhesion and seal the base layer; Apply topcoat again to enhance decorative appeal.

The interval between each layer must strictly follow the product instructions (usually 2-4 hours).

Color difference control

The same batch of paint should be used on the same wall to avoid mixing products from different batches.

After confirming the color of the sample, proceed with large-scale construction.

4、 Environmental Protection and Health: How to Choose Low VOC Coatings?

View environmental certification

Priority should be given to products that have passed the "China Environmental Labeling Certification" or "France A+" certification.

Pay attention to the VOC content index (national standard requirement ≤ 200g/L, water-based coatings can be as low as 50g/L or below).

Construction protection

Wear masks and gloves to maintain indoor ventilation.

Thoroughly clean the tools after construction to prevent residual solvents from evaporating.

5、 Special scenario applications: waterproof coatings and anti-corrosion coatings

Toilet waterproofing

Choose polymer cement waterproof coating, apply 2-3 coats, with a total thickness of ≥ 1.5mm.

Strengthening treatment is required at the corners of yin and yang, as well as at the root of the canal.

metal anti-corrosion

Using a combination of epoxy zinc rich primer and polyurethane topcoat to extend the service life of metals.

Thoroughly remove rust before construction to ensure a surface cleanliness level of Sa2.5.

6、 Future trend: Development direction of environmentally friendly coatings

With the upgrading of environmental regulations, low VOC products such as water-based coatings, powder coatings, and inorganic coatings will become mainstream. The application of innovative materials such as bio based resins and photopolymerization technology will further enhance the environmental friendliness and functionality of coatings.

conclusion

The selection of coatings and paints directly affects the construction quality and living health. By scientifically selecting products, standardizing construction processes, and paying attention to environmental performance, common problems can be effectively avoided, creating high-quality decorative effects.