Car paint: 9 rework problems you have to avoid

 China has become the world's second largest auto country, and has overtaken the United States to become the world's NO.1 trend. Sheet metal painting project we call Chaoyang industry is not too much, but with the development of the Internet, car owners are becoming more and more professional, we need to provide a higher standard of service to meet the needs of all-round owners, the following we introduce you to 9 common spraying problems and solutions.acid/solvent erosion is
: the paint film is subject to chemical corrosion
the
.
a) brake oil, peroxides (atom ash drying agent), battery solution and other corrosive substances accidentally spilled on the paint film.
b) acid rain falls on the paint film.
c) used detergent on the new paint film.
:
a) always keep the paint film surface clean and protect the paint film when working on the vehicle.
b) Avoid using detergent on new paint films.
c) to ensure that the paint film is fully cured.
:
a) paint film damage is minor and can be repaired by sandpaper polishing, grinding and polishing.
b) paint film is severely eroded, completely removing the erosion paint layer and re-spraying it.tweezers
: the paint film is trapped in water or dirt.
a) surface is not clean, residual water, oil, industrial pollutants or grease on the fingers and other contaminants.
b) does not match the material, or does not use the prescribed thin material.
c) paint film thickness is not enough, increase the breathability of the paint film.
d) water seeps into the newly sprayed and old paint film. The paint film is subjected to rain or exposure to high temperatures before it is fully cured, as water vapor seeps into the production bubbles.
:
a) vehicles should be parked to protect the paint film surface, before spraying to thoroughly clean the surface.
b) Can only use materials of good quality and specified use.
c) is operated according to the correct spraying process.
d) Avoid exposing the paint film to dramatic temperature changes until it is fully solidified.
:
the bubble with a needle to determine the depth of the bubble, with a low magnifying glass to find out the cause of the bubble. When the bubbles appear between the paint layers, polish out the defective area to reveal the intact paint layer and repaint. If the defect is serious, or if the bubble occurs between the primer and the substrate, remove all the lacquer layer above the substrate and repaint it. the
: the air trapped under the paint film expands, separating the paint film from the substrate.
a) atomic ash, filler ash or primer construction methods are not proper, the air into the paint film.
edges at the coating film connections are mishandled.
c) paint film cover on a gap or dead end, so that the paint film under the formation of a gap.
d) to form pores or bubbles in the primer using inferior or insufficient material, too high pressure on compressed air, or dry spray.
) does not properly handle and close the substrate, especially when spraying fiberglass surfaces.
f) when drying the paint film is too high.
:
a) Correct use of atomic ash, filler ash, or primer.
b) make the feather edges correctly.
c) avoid painting once sprayed too thick, to ensure that paint seeps into crevices and dead corners.
d) Be sure to use the recommended material and follow the correct spraying process. The primer should be sprayed thinly and wet.
) to check the substrate for air holes, pay special attention to the glass and steel surface of the plastic layer bubbles. Carefully remove the bubbles and close the substrate.
the paint film when baking a paint film, prevent the temperature from being too high.
:
the corresponding paint film according to the depth of the bubble all polished off, repair the lower defects, re-spray the paint. fish
: paint surface stress changes.
silicon-containing organic compounds are present in the paint environment or on the substrate surface.
b) other sources of contamination, such as grease, soap lumps, detergents, dust, wax, or oil from spray guns.
c) primer contains mismatched ingredients.
d) the steam in the paint room is saturated.
prevention:
a) completely remove silicone-containing polishes from the spray surface. The use of silicone-containing polishes in the paint shop is prohibited.
b) Clean the substrate surface with a dewax skimming cleaner by wiping it off. Clean the substrate surface before grinding, and the cleaning area is larger than the area to be polished. After grinding, be sure to remove the grinding chips from the substrate surface. Clean the substrate with a cleaner before you can paint.
c) ensures good maintenance of the spray gun and compressed air equipment.
: The
remove the paint layer from the defective area thoroughly, then treat the substrate according to the method above and repaint it. If necessary, anti-fish eye agents can be added to the paint. However, before using such additives, be sure to consult the paint manufacturer about how to use them. the
: the film thickness of the silver paint layer is uneven.
a) spray method is improper.
b) spray-painted fan surface is not adjusted.
c) paint film is too thick, paint mix is uneven, thin material quality is too poor or the model is not right.
d) substrate surface temperature is too high or too low.
prevention:
a) take the correct spraying method.
b) before starting spraying, adjust the fan surface of the spray gun.
c) in accordance with the prescribed proportions of the full mixing of even paint, the use of the recommended model of thin material.
d) ensures that the temperature of the substrate surface is within the recommended temperature range.
repair method
if you have not sprayed varnish, you can spray another layer of silver powder paint to cover the cloud area. Otherwise, the paint film should be polished and re-sprayed. of the
: the stress in the paint film is too great.
a) paint mix is uneven, thin or not the right model.
b) paint film is too thick, or spray paint on underlying paint that is not fully cured or too thick.
:
a) before spraying, mix the paint evenly and use the thin material according to the specified proportions and models.
d) use the correct spray method, each layer of paint film should be thin and wet, to ensure that there is sufficient leveling time between the paint film.
c) only use matching additives.
repair method
the paint film that polishes the cracked area until a complete, smooth surface is exposed, and then sprayed. the bite
the main reason: uneven curing inside the paint film.
a) paint film is too thick.
b) the leveling time between the paint layers is insufficient, forced drying, uneven air temperature.
c) paint used in the thinning model is not correct or the quality is too poor.
prevention:
a) sprayed each layer of paint film should be thin and uniform.
b) the leveling time between the paint layers should be sufficient, drying temperature should be appropriate and uniform.
c) only use the recommended model of thin material.
repair method
first let the paint film fully cured. When the defect is minor, polishing and polishing is simply caused. If the defect is more serious, polish the paint film to the substrate and repaint it. orange peel:
paint condenses improperly on the surface of the paint film.
a) spray method is not correct, the spray gun is too far away from the substrate, the spray pressure is not correct, and the nozzle is not adjusted correctly.
b) paint film is too thick or too thin.
c) paint mix unevenly, the viscosity is not appropriate, the thinner model is not correct or the quality is too poor.
d) there is not enough time to level the coatings.
) ambient temperature is low or the substrate surface temperature is not suitable, paint when there is a wear wind.
prevention:
a) take the correct spray method to ensure that the equipment is properly adjusted.
b) ensure that the paint mixes evenly.
c) use the recommended thinner.
d) there should be sufficient leveling time between the coatings.
) is sprayed in the recommended temperature range and ventilation should be appropriate.
repair method:
a) polished after polishing.
b) is severe, polish it and re-spray it. polishing marks are
: the paint film was damaged by research wear.
a) paint film is polished without adequate curing.
b) the polisher is under too much pressure or at too fast a speed.
c) abrasive is too coarse or salty, the polish is not suitable, the polishing wheel, polishing cloth is too dirty, too rough.
:
a) paint film is completely cured before polishing.
b) the pressure of the polishing machine should not be too large, the speed should be appropriate.
c) use the correct model, fine abrasive, polish.
) Polishing wheel, polishing cloth to be soft and clean.
repair:
the paint film is completely cured, smoothing and re-polishing. When the defect is serious, polish the paint film smoothly and repaint it.