Defects

Etiology

Solution

Vertical flow

1. Excessive diluent causes the paint viscosity to be too low and loses its viscosity.

2. The amount of paint is too large, the spraying distance is too close, and the moving speed of the spray gun is too slow

3, each painting or painting too much, too thick or recoating interval is too short

4, the paint contains a high density of pigment, mixing is not uniform

5. The surface of the coated object is too smooth

6, the temperature is too low, drying is too slow

1. Proportioning as required

2. Control the amount of paint, the spraying distance is 20-30cm, and control the appropriate spray gun moving speed

3, each coating should not be too thick, the coating thickness should not exceed 30cm at a time, and master the coating interval time

4, the construction of paint to fully stir evenly

5, the coating should be carefully polished

6. Keep the coating room temperature at 15~30 ℃

Grain

1, the operation site is not clean, dust mixed into the paint

2. After the paint is mixed and placed for too long, the paint and hardener have produced copolymer particles.

3. The oil output from the spray gun is too small, and the air pressure is too large to cause poor paint atomization or the spray gun is too close to the object surface.

1. Clean the spray booth and cover the paint bucket

2, paint configuration should not be placed for too long

3, paint spray gun, in order to make it in the best working condition, to determine the muzzle distance from the surface of 10~20cm is appropriate

Orange peel

1, the diluent is too little, the paint is too thick, so that the film leveling is not good

2, too much hardener, so that the paint drying speed reaction intense

3. The spraying air pressure is too high to blow up the paint wax so that it cannot be leveled.

4, the temperature of the work is too high, so that the paint film reflects the dramatic speed

5. The temperature of the coated material is too high

6. The spraying distance is too far or too close

1, according to the instructions for use ratio, adjust to the appropriate viscosity

2. Proportioning according to the instructions for use

3, adjust the air pressure, not too much

4, pay attention to the site temperature, can add slow dry water to inhibit the drying speed

5. Reduce the temperature difference

6, determine the muzzle distance of 10~20cm is appropriate

Blistering

1. Compressed air is mixed with water on the paint film

2, the operation site temperature is high, paint drying too fast

3, the surface moisture content is too high, the air humidity is large

4. One-time spraying is too thick

5. Poor filling

6. The viscosity of paint blending is too high

1. Oil-water separator, pay attention to drainage

2. Add slow dry water

3, surface treatment clean, paint plus anti-white water

4, once should not be too thick, depending on the amount of oil 2-3 times to master

5. Fully fill the substrate

6, the deployment of appropriate spraying or brushing viscosity

pinhole

1. Excessive hardener, too much and too thick spraying at one time

2, each spraying time interval is too short, resulting in the paint film is too thick

3. Paint viscosity is too high

1, according to the proportion of modulation, a spray can not be too thick.

2. After the paint film is completely dry and polished, apply another layer.

3, the deployment of appropriate spraying or brushing viscosity.

White

1, the operation site temperature is large, the paint film reflects violently, may be combined with moisture in the air to produce whitening phenomenon

2. One-time spraying is too thick

3. There is moisture in the jet

1, pay attention to the site temperature, can add anti-white water, prevent whitening phenomenon

2, each coating to not more than 35μm thickness is appropriate

3. Compressed air filtration

Cracking and shedding

1, excessive hardening agent, make the film brittle and lose toughness

2, the lower layer is not dry, the upper layer is too thick, resulting in poor density

3, the bottom layer is not clean, there is oil, improper pretreatment, affecting the density

4. The hardening agent is added to the paint without stirring evenly, which makes the hardening poor.

5, the bottom surface is incompatible, occlusal phenomenon occurs, causing shedding.

6, when mixing paint to stir evenly, to prevent the pigment and paint separation, so that the film tight poor

7, wood moisture content is too high or too low

1. Proportioning as required

2. Do not apply the lower coating, never apply the lower coating

3. Clean and blow dry with thinner

4. Fully stir evenly

5, pay attention to the bottom matching

6. The pigment-containing paint shall be stirred evenly before deployment.

7. The moisture content of wood is controlled at 8-13%

Bite the bottom

1. The upper and lower paint is not matched

2. The interval between layers is not enough

1. The matching upper and lower layer paint shall be used

2. Apply a layer of paint after the paint is dry.

Uneven gloss

1. The paint film is too thin and the diluent is added too much

2. Rough surface and poor sealing

3. Apply the lower layer before the bottom layer is completely dried

1. Thinner should be added proportionally and the number of coatings should be increased

2, the surface grinding must be smooth, the bottom layer closed thoroughly

3. After drying, apply a layer (preferably with non-stick sandpaper)

Shrink oil flowering

1, the surface contains oil, wax class unclean impurities

1. Scrub the surface with thinner and polish it clean

slow drying speed

1. The ambient temperature is too low or the temperature is too high

2, hardener ratio is too small or misuse of slow drying diluent

3, the coating has water, oily wax and other adhesion

4. The water content of the coated material is too high

5. Too thick coating

1, should avoid the temperature below 5 ℃ construction or temperature above 80 ℃ construction

2, should be prepared according to the correct proportion, should choose the appropriate quick drying diluent

3. Clean with diluent or alkaline liquid

4. The moisture content of wood is controlled at 8-13%

5. Appropriate spraying, the film thickness should not exceed 35μm