Newly purchased spray guns are usually coated with anti-corrosion oil and must be cleaned before use. Remove the nozzle and put it in a thin cup of thinner
Newly purchased spray guns are usually coated with anti-corrosion oil and must be cleaned before use. Remove the nozzle and put it in a thin cup of thinner to clean it. This cup of thinner can be left for cleaning after use. When using or reusing thinner materials, you should minimize consumption, not only reduce waste, but also prevent environmental pollution. Carefully clean grease and metal debris from the nozzles and other parts of the threads.
Fill the paint cup with a half cup of warm soapy water, then place it on the spray gun and shake it vigorously to clean the paint cup and siphon. Use a spray gun to spray soapy water and clean the internal piping of the gun.
Finally, use nitrocellulose thinner or alcohol to remove any dirt that cannot be washed off by soapy water. When painting with a spray gun normally, remember to wear gloves, a respirator, and operate in a well ventilated area.
Note: Experienced painters can clean the gun with as little thinner or solvent as possible. Whether it is sprayed with nitrocellulose or water-based paint, use 1
The ounces of thinner or water can be cleaned up. It is very wasteful to use a spray gun to spray the thinner to clean the nozzle. The nozzle should be removed and the soft brush should be used to clean the thinner. After repeated washing several times, dry the paint cup and pelvis.
After multiple cleanings, the thinner used for cleaning becomes dirty and unusable. Remember not to pour the discarded thinner directly into the sink or spill it outdoors. If there is not much waste thinner, the best way is to let it evaporate naturally, or it can be sprayed onto the exhaust fan for painting to evaporate. Be careful not to allow the vaporized gas of flammable thinner to accumulate too much in the enclosed space to avoid explosion in case of fire.
Connecting the trachea
In order to connect the gun to the compressed air, a suitable interface is required to connect the compressed air tube. The ordinary male 1/4" metal gas can be screwed onto the spray gun. Note that the dry rubber strip should be wrapped around the thread to prevent air leakage.
Commonly used compressed air hoses have an inner diameter of 5/16" or 3/8". If the length of the air pipe is less than 25', a 5/16" inner diameter hose can be used. If the length exceeds 50', it is best to use 3/8".
Inner diameter hose. Air pressure adjustment generally depends on the length of the hose: 15' long hose requires 30 atmospheres; 25' long hose requires 35 atmospheres; 50' long hose requires 40
Atmospheric pressure.
Use of regulating valve
When using the spray gun for the first time, you can practice with water first. A half cup of water can be placed in the paint cup, and the parts of the spray gun should be blown dry after practice.
- Turn off the fan and flow control (clockwise to the head)
- Turn the air flow valve counterclockwise until the head opens to maximum.
Press the trigger and slowly open the flow control valve. This valve is used to control the amount of paint sprayed from the spray gun. When the valve is unscrewed, the pattern sprayed from the nozzle should be round. If you want to spray small objects, upper finishing layer or spray primer, you should close the small flow control valve properly; if you want to spray large area plane, you can open the large valve to increase the paint flow. The flow control valve should be adjusted with the fan control.
The fan control valve is used to adjust the pattern of the sprayed paint on the surface to be painted. Opening the fan control valve allows the pattern to be angled to an oval shape, and closing it allows the pattern to become a perfect circle. The shape of the sprayed pattern can be flexibly adjusted as needed. If the width of the pattern is increased, the paint flow should be increased accordingly.
- Loosen the buckle on the nozzle and rotate the nozzle to control whether the sprayed pattern can be stretched horizontally or longitudinally.
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The normal pressure range should be 1550
The smaller the spray pattern between the atmospheric pressures, the lower the pressure required. Every painter thinks the right pressure is different, depending on his taste. Here are some typical air pressure applications:
1520 atmospheres: blow clean, touch, primer, gradient paint and thinner paint.
2025 atmospheres: a smooth coating, especially suitable for lacquers.
3545 atmospheres: spray a closed primer or top coat.
50 atmospheres: water based coating
As long as the paint can be broken down into a mist and ejected, the pressure should be reduced as much as possible, and if the pattern to be sprayed is not flat enough, the pressure can be appropriately increased.
dilution
The 1.8mm nozzle on the nozzle meets the direct spray requirements of a wide range of coatings without dilution, including water-based paints, seal primers, solvents and thinner varnishes. There are many ways to dilute the paint, from direct sprayable paint to rare ones.
The dilution ratio of the thinner and the 2 parts of the paint can be tried. If you want to spray a thin layer or repeatedly find the color in the paint repair, you can add more thinner.
Spray undiluted paint should be tested before starting dilution. If the paint sprayed from the nozzle has droplets splashing or foaming, the thinner material can be gradually increased until the sprayed pattern is uniform and no large droplets appear. If necessary, the air pressure can also be increased appropriately.
Injecting paint
After the paint is stirred or shaken evenly, pour into the paint cup at one time. Inverted paint bucket 1
In about minutes, let the paint completely drip into the paint cup, and finally use a finger to bounce a few paint buckets to let the paint remaining in the bucket drip down. Used paint buckets should be covered as soon as possible to prevent the paint from decomposing or drying out.
Spraying
When spraying, the spray gun should be 58 inches from the surface to be sprayed (12-20
Cm) Press the trigger and test the waste to see if the traces are normal. The lacquer that has just been sprayed should look wet and the water-based paint should look semi-dry.
The gun should always be perpendicular to the surface being sprayed and move parallel to the spray surface, maintaining a constant distance from the spray surface. The paint movement should not be curved to avoid uneven overlap of the spray marks. The trace of each spray should overlap with the last one third.
The speed of the spray gun should be appropriate. Too slow will cause the paint to accumulate too much. If it is too fast, the dry paint will look very rough. The right speed should be found based on your own experience.
When spraying the body, a long handle should be placed in the neck of the neck to facilitate movement. Gradually spray down from the end of the body, spray one side and then spray the other side.
When spraying the front or back of the body, adjust the spray pattern of the gun to a vertical oval shape, and spray it from left to right from the end of the piano. Each line of spray marks should overlap with the previous line by about one-third, and each time the entire surface is completely sprayed.
The significance of spraying from top to bottom is that if the sprayed paint flows down, it can be dissolved by the paint that has just been sprayed. When painting a vertical surface, the gun should move faster, preventing the paint from accumulating down or the local coating being too thick.
Cleaning after spraying lacquer
If you need to do painting work intermittently throughout the day, you don't have to clean the gun every time you finish today's painting work. When cleaning the spray gun, remove the compressed air hose and paint cup, then press the trigger to allow the accumulated paint in the spray gun to drip into the paint cup. Once these methods have been completed, the gun can be completely cleaned as described previously.
After the cleaning is completed, it is likely that a small amount of thinner material will remain in the paint cup, and the paint cup can be directly put back on the spray gun without waiting to be used for the next use. Do not press the trigger after the final cleaning, so as not to return the thinner material stored in the spray gun into the paint cup, which will ensure that the internal components are clean and prevent sticking. Note that this method cannot be used in the case of water-based paints.
Cleaning after spraying water-based paint
After each spray, the water-based paint should be poured back into the paint can as soon as possible, then rinse the spray with water. After controlling the paint in the spray gun, add a little water to the paint cup, shake it thoroughly and spray it out from the nozzle. Wipe off any paint left on the outside of the gun, then put it in the sink and clean the sink. Turn the gun upside down and flush the siphon with warm water to let the water flow out of the nozzle. Dry or dry all accessories after cleaning.
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Tag: spray gun paint water-based paint closed primer evaporative gas
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