Have you solved the problem of water-based industrial paint?

1.

In the process of painting or drying of the paint film, wrinkles or shrinkage and deformation appear on the surface of the topcoat.

Cause:

Inappropriate drying methods lead to uneven drying of the paint surface

Two, uplift

Protrusions are also called wrinkles

Cause:

1.

2.

Correction method:

Polish the defective area until it is smooth but cannot be worn through, and paint again

Three, sag

Also called weeping or weeping

Cause:

1.

2.

Correction method:

When the sagging phenomenon is slight, wet sand the defective area with fine sandpaper after the paint surface is dry.
When the sagging phenomenon is serious, polish the defective area and paint again
.

Four, wet printing or wax marks under the coating

From the surface of the paint layer, you can see the outline of the contaminated area on the bottom layer, or the appearance of matt spots of various shapes
.

Cause:

1.
The surface of the bottom layer is not thoroughly cleaned before spraying, for example, grease or waxy substances are not completely removed
.

2.
The previous paint layer is dry or the defects of the old paint layer are not removed
.

Correction method:

If the mark is obvious, the paint layer should be polished off and sprayed again
.

Five, water mark

White or yellow corrosion-like spots appear on the surface of the paint layer, which mostly appear on the surface of the vehicle compartment, engine compartment cover or trunk cover that is perpendicular to the sun
.

Cause:

1.
The coating layer is in contact with water droplets without sufficient drying, especially water with high mineral content
.
After the water droplets mix with the water in the paint, they will penetrate into the paint surface, leaving water marks
.
Therefore, the paint surface after spraying is strictly prohibited from contacting with water, and driving in rainy weather is strictly prohibited
.

2.
Even if it is a dry paint surface, if frequent contact with water droplets will leave water marks on the paint surface
.
Under sunlight, the water droplets have the transmission focusing function of a magnifying glass.
After the water droplets dry, they will leave a white or yellow corroded outline on the paint surface
.

3.
If the sprayed paint surface is too thick, the drying time will be prolonged, and the chance of leaving water marks on the paint surface after contact with water droplets is greater
.

Correction method:

Use a finer polishing agent or a coarser polishing agent for polishing, depending on the depth of the watermark
.
In the case of particularly serious watermarks, the watermarks will reappear after polishing for a few days, and the cleaning should be repeated many times to completely eliminate the watermarks
.
If cleaning does not work, you should use fine sandpaper to wet sand the water-marked area and re-spray
.

Six, wire walking

That is, the silver powder reflects unevenly
.
The silver powder particles are arranged in the same direction, showing stripes of light and dark
.
If there is wire running on a vertical surface, in most cases, the deposited silver powder will pierce the paint film
.

Cause:

1.
Silver paint is a mixture of pigments, moisture, metal particles of a certain size and additives.
The distribution ratio of metal particles in the pigment will affect the color of the paint surface
.
If the silver powder paint is not fully stirred evenly before spraying, metal particles will be deposited on the bottom of the container, resulting in too many metal particles in the bottom paint, making the paint film too thick, and uneven paint surface color
.

2.
The construction viscosity of the paint is incorrect, that is, the dilution ratio is problematic
.
If the dilution viscosity is too high, the phenomenon of wire running and metal ion aggregation will occur.
If the viscosity is too low, the paint film will be too thin, and the paint film performance will deteriorate.
You must choose a suitable viscosity that can meet the requirements of both aspects
.

3.
The time interval of each spraying is too short
.
If the silver paint is not sufficiently dried, the uneven distribution of metal particles will occur
.

4.
Improper adjustment of the spray gun or poor painting technique
.
Compressed air pressure is too low, or the distance between the spray gun and the sprayed surface is too close, or the spray gun moves at an uneven speed, which will cause the silver paint surface to appear dark and dark
.

Correction method:

Polish the paint with fine sandpaper and spray again, or increase the compressed air pressure after the paint is completely dry, increase the distance from the spray gun to the sprayed surface to 40-50cm, and then spray a layer of fast-drying silver paint
.

Seven, fisheye

Also called shrinkage or bead hole
.
Small round pits appear on the paint surface, sometimes scattered, sometimes clustered
.

Cause:

1.
The surface of the primer is contaminated, such as oil on the primer, so the spray surface must be cleaned before spraying, and a neutral detergent can be used
.

2.
Strictly filter the compressed air used by the spray gun to ensure the purity of the compressed air, because silicones are often found to come from compressed air pipelines rather than paint
.
Evacuate and clean the compressed air filter every day to remove moisture and dirt from the filter, and drain the air compressor every day
.

Correction method:

Clear the affected area and repaint
.

8.
Poor hiding power

Also called translucent or bleeding
.
The color paint cannot completely cover the color of the original paint surface, or the color of the old paint film or the color of the primer layer penetrates into the top paint layer, changing the color of the top paint
.
The red and yellow paint layers have more bleeding
.

Cause:

1.
The colored paint produces precipitation
.
After the topcoat was diluted, the paint was not sufficiently stirred, and the pigment was deposited on the bottom of the container, which caused the resin content in the sprayed paint to be too high and the color became lighter
.

2.
Wrong spraying technique
.
For example, each subsequent layer of coating is not sprayed repeatedly, resulting in a striped paint surface or poor coverage
.

3.
Too much water is used to dilute, so that the coating becomes very thin
.

4.
The old paint layer or the bottom coating contains pigments that can cause color bleeding.
Therefore, the old paint layer should be handled carefully, and an isolation layer that can prevent color bleeding can be sprayed
.

Correction method:

If there is slight bleeding, you can spray enough paint to cover it
.
For the paint surface with severe bleeding, it should be polished off and sprayed again
.

Nine, the primer is cracked

In the paint repair area, the primer layer in the filling area of ​​the bottom putty cracks, which causes the top paint layer to crack
.

Cause:

1.
The middle coat primer layer is too thick, and the drying time between each layer is not sufficient, so that the surface of the middle coat primer layer is dry and the bottom layer is soft, causing the middle coat primer layer to crack
.
Therefore, in the primer spraying, a thin layer of multiple applications should be adopted, and sufficient drying time should be allowed according to the climatic conditions
.

2.
The transition area between the primer layer and the old paint layer, that is, the feathery edge is not adequately treated, which causes the putty and the coating to be incompletely combined and cracked.
It should be polished with 600 grit sandpaper and avoid bringing moisture into it.
The lower deep scraping layer
.

Correction method:

Thoroughly sand the cracked area, scrape the bottom putty and spray the primer and topcoat again, paying attention to allow enough drying time between the coatings
.

Ten, small cracks

The paint surface is seriously shiny, and there are many small cracks on the top paint layer, which are similar to the cracked shape of the soil in a dry pond.
The cracks often present a triangular, star-shaped or irregular radial shape
.
Cracking generally occurs in the topcoat layer, and sometimes penetrates into the inner coating layer
.

Cause:

The paint film is too thick
.
Too thick topcoat will amplify the normal stress and cause cracking, so a thinner coating should be sprayed multiple times
.
Moreover, sufficient drying time should be allowed between each topcoat spraying operation, and the spray gun should not be used for drying
.

Correction method:

If the cracks cannot be removed by grinding and polishing, the cracked parts should be thoroughly polished and smooth
.
In severe cases, the paint layer should be removed until the metal layer is exposed and then sprayed again
.

11.
Brittleness

Also called a tear or scratch, a crack exhibits an irregular line shape extending outward
.

Cause:

1.
During the spraying process, the spray paint is too thick, resulting in the final total thickness of the old paint layer and the new paint layer being too large and cracks appear
.
Therefore, the operating specifications for multiple spraying with thinner coatings should be strictly followed to achieve the correct coating thickness
.

2.
The paint layer is too thin, especially if the top paint layer is too thin, it will cause the paint layer to crack or fall off prematurely
.

3.
The quality of the paint is too poor, or the paint surface is exposed to sunlight for a long time, or the chemical substances in the atmosphere cause corrosion on the paint surface.
These conditions will lead to cracks
.

4.
The old paint layer or the influence left over from previous repairs
.
Make sure that the top paint matches the bottom layer, and the old paint layer in the bottom layer should not be too thick
.

5.
Factors such as climatic conditions and paint thickness will affect the drying time of the paint layer.
Therefore, the construction cannot be absolute according to the drying time, and it should be flexibly controlled
.

6.
The paint has not been fully stirred evenly or sprayed with partially gelled paint
.
If the paint is stirred unevenly, the additive components in the paint will not be able to fully function, and the paint surface will have weakened stress resistance and cracks will appear
.

7.
The paint is sprayed on the surface that is too cold, such as the surface of a one-component acrylic varnish.
If the temperature is too low, the film is not completely formed, causing the paint film to crack
.

Correction method:

Thoroughly polish the cracked area to the primer layer and re-spray
.
In severe cases, the paint layer should be removed until the metal layer is exposed and then sprayed again
.

12.
The expansion of sandpaper traces

Cause:

After the bottom layer is polished with coarser sandpaper, no putty layer or primer is used to fill the sandpaper traces
.

Correction method:

Use dry sanding or wet sanding to smooth the sandpaper traces, then scrape the putty layer, spray primer and topcoat
.

13.
Bottom rust

Small rust spots, spots, bubbles or peeling appear on the surface of the paint film
.
When the surface paint is peeled off, the area of ​​rust under the paint layer is larger than that seen on the surface.
This phenomenon is also called "rust spread"
.

Cause:

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2.
Improper temperature
.
When the ambient temperature of the spraying operation is too high, the paint particles are already over-dried when they reach the sprayed surface, resulting in poor leveling
.

3.
Improper drying
.
Before the paint particles on the sprayed surface are leveled, a forced drying process is carried out, which will increase the chance of orange peel on the paint film
.
During multiple spraying, if the paint film of the previous spraying is too dry, the water in the paint sprayed again will be absorbed by the bottom layer, and the paint particles sprayed again cannot be leveled
.

4.
Uneven mixing of paint
.
After the paint is stored for a long time, the bottom layer will precipitate.
The paint should be fully stirred before spraying, otherwise the parts will be unevenly dried, resulting in orange peel
.

Correction method:

If orange peel has been produced, when the paint film is completely dry, when the situation is serious, use fine sandpaper to polish the orange peel surface to a smooth surface, or re-spray

15.
White fog

Also known as fogging or surface dullness, it will show a milky white fuzzy appearance on the surface of the paint layer during or after the spraying process.
This phenomenon only appears on the single-component acrylic varnish paint film
.

Cause:

1.
The appearance of white fog is often related to bad weather
.
In high temperature or cold humid weather, the moisture in the paint evaporates slowly, and the moisture in the air adheres to the surface of the paint film, causing the temperature of the paint layer to drop.
At this time, the moisture in the air condenses on the surface of the paint layer, resulting in White mist
.

2.
Improper adjustment of spray gun or compressed air
.
If the compressed air pressure is too high, it will also cool the wet paint surface and increase the progress of moisture condensation
.

Correction method:

Re-spray in a suitable working environment
.