There are bubbles in the paint, there are bubbles after painting, what is the reason

1) The substrate treatment is not up to standard, such as the high moisture content of the wood, or the pine resin and the aromatic oil contained in the wood itself are not removed, which will lead to blistering when it volatilizes naturally. (2) Apply the finishing layer when the oily or water-based putty is not completely dry or the base coating is not dry. (3) The joints and holes of the wood are not filled, and there are voids and holes.

4) The paint viscosity is too high. (5) The paint ratio is inappropriate. (6) Drag the brush back and forth when brushing, and the bubbles generated are not eliminated.

7) The surface of the substrate is attached to oil, dust, blisters, etc., and these impurities are stained with water. (8) There is water in the compressor and air pipe, or there is water splashed on the construction surface. (9) Most of them are the same as pinhole causes.

Reason: First of all, the bubble is punctured, if there is water coming out, it means that there is moisture infiltrating under or behind the paint layer, and the water will evaporate into steam after the sun, and the patent leather will be blistered. To do this, a hot air spray gun should be used to remove the blistering paint, allow the wood to dry naturally, then apply a primer and finally repair and paint the paint surface.

If there is no water in the bubble, it may be that the wood grain is cracked, and there is a small amount of air inside, and when the sun is exposed, the air expands, and the patent leather bulges.

Solution: Scrape off the blistered patent leather first, then fill the cracks with resin filler and repaint.

The cause of this phenomenon is that there is a gas in the coating that breaks through the coating and bulges to form bubbles, which can then crack or wear out to form pinholes. When the drying rate of the surface layer of the coating is slightly higher than that of the inside, when the surface layer begins to condense and the internal solvent or air continues to evaporate, it will break through the surface layer of the coating to form bubbles.

1. The viscosity of the coating is too high, the coating is thick at one time, and the hole filling is not real and contains air, especially some porous substrates are not closed primer.

2. The spraying air pressure is too high, and too much air is mixed into the paint;

3. Oil, dust, sweat, etc. are attached to the surface of the coating, and moisture is gathered around these unclean objects;

4. The temperature difference between the paint and the coated surface is too large;

5. Improper use of thinner and excessive addition of curing agent;

6. The coating environment temperature is too high or the relative humidity is too high;

7. When the heating and drying coating is used, the temperature is too high, the standing time before the coating is heated is not enough, the solvent is not fully volatilized, the paint itself brings bubbles, and the bubbles generated during stirring are not eliminated, etc.

There are many reasons for blistering, the main possible reasons are: 1. The putty scraped on the car is not completely dry and is hurriedly sprayed; 2. When making sheet metal, the iron sheet of the car is broken, and the putty is scraped without timely welding; 3. Before spraying the surface paint, the surface of the primer is not completely cleaned; 4. The quality of putty is too poor, or the air is too humid when spraying, the paint ratio is incorrect, etc.!

1. The paint with low water resistance is used for the finishing of water-soaked objects, and the oily putty used is not completely dry or the primer is not dry.

2. When painting, the compressed air contains water vapor, which is mixed with the paint.

3. The temperature of the construction environment is too high quietly, or the primer is not dried due to strong sunlight, and the paint is applied when it encounters rain.

4. The primer is not well finished, leaving a small air hole, the paint variety is not used properly, the paint film is too thick, and the surface of Yundan is not firmly bonded, or the adhesion between the layers is lacking.

1. The paint with low water resistance is used for the finishing of water-soaked objects, and the oily putty used is not completely dried or the primer is not dry before the topcoat is applied.

2. When spraying dust and residual paint, the compressed air contains water vapor, which is mixed with the paint.

3. The temperature of the construction environment is too high, or the primer is not dried due to strong sunlight, and the paint is applied again when it encounters rain.

4. The primer is not well finished, leaving a small air hole, the paint variety is not used properly, the paint film is too thick, the bond with the surface is not firm, or the adhesion between the layers is lacking.

Solution: When rolling coating, reasonably grasp the speed of rolling coating and slowly roll coating; After the amount of glue on the drum is basically gone, re-roll at the position where it has just been rolled to evenly carry out the amount of glue and reduce the existence of air bubbles.

1. Be sure to read the construction instructions in the product packaging text carefully before use to obtain reliable and satisfactory coating results;

2. Open all doors and windows as much as possible before starting operation and use, and ensure that there are enough ventilation strips in the construction area to dissipate parts;

3. If it is allergic**, you should always wear protective equipment during use; If the eye area is accidentally contaminated, the respondent should immediately rinse with plenty of water and seek medical assistance;

4. Do not allow children or pets to enter the construction area, and place the product out of reach; In case of accidental contamination, rinse immediately with plenty of water and seek medical assistance;

5. Effectively separate, cover and shield the area of wood products and walls, better maintain the cleanliness of the construction site, avoid chaotic construction operations, and operate in accordance with the construction sequence of first applying wood paint and then applying latex paint after drying.

6. Do not pour paint into the sewer or drain pipe to prevent blockage.

There are many reasons for blistering, and the main possible reasons are: 1. The putty scraped on the car is not completely dry and is hurriedly painted; 2. When making sheet metal, the iron sheet of the car is broken, and the putty is scraped without timely welding; 3. Before spraying the surface paint, the surface of the primer is not completely cleaned; 4. The quality of putty is too poor, or the air is too humid when spraying, the paint ratio is incorrect, etc.!

Car painting refers to the application of a layer of paint on the surface of a car to protect the car. Automobile painting is generally baked paint. In a car factory, the frame and body are welded, and the next process is painting.

The forms are ordinary paint, metallic paint, and pearlescent paint. Automobile painting process: putty scraping, grinding, painting, etc.

Automobile painting includes: ordinary paint; metallic paints; pearlescent paint; Varnish; Matte lacquer. In spray painting, there are various solvents containing benzene and benzene compounds, such as toluene, xylene, etc.

Commonly used industrial solvents such as ethanol and butanol in diluents are also toxic, and some are even highly toxic, such as methanol. The existence of these toxic substances has a certain toxicity to the nervous system, respiratory system and ** of the human body, and the most common phenomena such as benzene poisoning and lacquer poisoning occur.

During the painting process, a large amount of volatile gases are often generated, which are diffused in the air. These large amounts of toxic hot gases, if inhaled by the human body, can cause neurological diseases, generally causing dizziness, palpitations, nausea and vomiting reactions. If the fingers and other parts are often exposed to various solvents and toxic gases, they will also cause corrosion, degreasing, itching, roughness, cracking and other diseases, so take protective measures.

Photo by Zeng Huiwen of Pacific Automobile Network).