Defects and countermeasures during painting construction

December 28, 2023

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Defects and countermeasures during painting construction
First, the pinhole
cause:
1. The wood surface material is poorly adjusted, the material surface is raised, and the filling is difficult.
2. The drying of the undercoat is not complete, that is, the application is applied to the upper coating, and the upper coating is rapidly dried.
3. There are dust, bubbles and paint viscosity in the coating film.
4. The temperature difference between the paint and the surface to be coated is too large.
5. When heating and drying, the temperature is too high, the standing time is not enough, and the solvent is not fully evaporated.
6, a thick coating, the surface of the dry bottom layer continues to evaporate and protrude.
7. Use poor paint thinner or wrong paint thinner.
8. The reaction coating adds an excessive amount of curing agent, or misuses the curing agent.
9. The coating environment is too high or the relative humidity is too high.
Method of exclusion:
1. The adjustment of the material should be completely complete and the sanding meets the requirements.
2. When spraying for a long time, the time to be dried is extended during recoating, so that the lower layer is more dry.
3. The painted work should be thoroughly cleaned.
4. The surface temperature of the object to be coated is the same as the ambient temperature.
5. When heating and drying, the solvent of the coating film is fully volatilized (the standing time is extended) and then re-constructed.
6, avoid too thick coating, and adjust the appropriate spray mucosa, the bottom layer and the surface is dry.
7. Confirm the correct diluent when using and select the appropriate thinner and coating.
8. Adjust the paint properly according to the specified paint adjustment ratio and mix well.
9. Improve the working environment, and control the temperature and humidity under appropriate conditions, or add slow drying solvent as appropriate.
Second, the bubble
cause:
1. The surface material of the wood is deep, the filling is difficult, and bubbles are generated.
2. Use a coating with too high viscosity.
3. The air pressure of the spray is too high, and the paint is mixed with too much air.
4. Preheating (heating and drying) is too intense or heated sharply.
5. The surface of the coating is attached with oil, dust, sweat, etc., and these impurities are concentrated around the water.
6. There is moisture in the compressor and air tube, or water splashes on the work.
7, most of the same reasons as pinholes
Method of exclusion:
1. The deeper material of the catheter is sprayed after being filled.
2. Adjust the viscosity of the paint appropriately.
3. Adjust the proper air pressure to reduce the incorporation of air.
4. When heating and drying, the rest time should be controlled and fully evaporated.
5. Pay attention to the surface cleaning when painting the surface to avoid contamination of unclean materials.
6. Timely drain the compressor water and install the oil water filter.
7, refer to the pinhole countermeasures.
Third, fisheye, crater, flowering
cause:
1. There are water, oily or oily waxes in the coating.
2. There are water and oil in the paint (mainly due to air compressor)
3. The workplace is contaminated or contaminated with oil and wax to the environment and work.
4. Use too much additive, or poor paint and use of expired paint.
5. Contaminated cloth, oily wax in the polishing place.
6. The undercoat or colorant is of poor quality or is contaminated.
7. In places filled with solvent gas, the working place is poorly exhausted.
Method of exclusion:
1. The coated object avoids pollution and needs to be thoroughly sanded.
2, the water wall and the water wall are kept clean, the water flow is smooth, avoid diving, and the air compressor oil should also pay attention.
3. Work places and appliances should avoid contamination of oil, wax oil, etc. Fingers and clothing should be cleaned before they can touch the work.
4. If the paint is stored beyond the storage date, it should be checked for deterioration.
5. Keep away from contaminated areas when painting, and the contaminated rag should be cleaned.
6. Pay attention to whether the paint contains other impurities.
7, the operating environment pay attention to adequate exhaust.
8. The old coating film is wiped clean with solvent before spraying and then sanded, and then sprayed.
9. Fish eye inhibitors can be added to the paint when serious fish eyes occur.
Fourth, rough coating
cause:
1. Spraying is too high viscosity.
2. Use a solvent solvent diluent that is too high in boiling point.
3. The spraying distance is too far or too far, and the spray gun or machine is faulty.
4. The indoor environment of the painting is too high.
5, super-spray semi-dry coating film, paint adhesion (this phenomenon is more in the corner or backlight side)
6. The attached object is attached with dust or too much environmental dust.
Method of exclusion:
1. Adjust the viscosity of the appropriate coating.
2. Use appropriately specified diluents and solvents.
3, skilled spraying technology and the use of the spray gun to operate correctly, regular maintenance of the machine.
4. Adjust the indoor temperature.
5, to avoid spraying, you need to train the operator's spray technology movements, postures and so on.
6. The spraying site should be kept clean and avoid contaminated areas as much as possible.
Five, sucking, sinking
cause:
1. Use an inappropriate diluent (solubility is too strong).
2. When the undercoat film is insufficient, it forms a porous occasion.
3. The undercoat is not dry enough or polished without drying.
4. Use sandpaper of too thick type when grinding.
5. The viscosity of the upper coating is too low, or the coating amount is insufficient.
6. Use poor quality paint.
7. The surface of the object to be coated is attached with dust and the paint powder is not removed.
8, the material fills poorly filled, or contains too much water.
9. Apply once after the next application, resulting in insufficient drying of the bottom layer (or recoating time is too fast)
Method of exclusion:
1. Carefully choose a good quality diluent.
2. The lower coating film should be sufficient and should be completely flat and non-porous after sanding.
3. The coating film should be fully hardened or dried before application.
4, sandpaper paper model should be selected for the fineness of the sandpaper.
5, reconcile the correct viscosity coating, uniform coating amount.
6. Use good quality paint and clean the surface of the coated object before spraying.
7. Before the painting, the material must be sanded and filled with soil. The moisture content of the wood needs to be moderate.
8. The coating method needs to be thinly coated several times and the control interval is elongated to make the undercoat sufficiently dry.
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