What are the precautions to take when using a spray gun?

I. Use of Personal Protective Equipment

It is well known that when using a spray gun (for painting or cleaning), there is usually a significant amount of organic gas volatilization. These gases (aerosols) are harmful to humans. Often, many operators do not pay attention to taking proper defensive measures. We must protect ourselves and should always wear protective equipment while operating the spray gun, such as paint-resistant coveralls, safety goggles, activated carbon masks, and solvent-resistant gloves.

II. Use of Low-Purity Compressed Air

Impurities in compressed air (such as water, particles, oil) often lead to major errors in spraying and fail to satisfy customers. To achieve the best spraying results, optimal air purification is absolutely necessary. For more information, please refer to the *Longshen Product Catalog*. For example, the French PEG brand compressed air filter (Longshen part number 35136) provides excellent purification effects.

III. Adjusting Air Pressure at the Compressed Air Inlet

Users often forget that as the diameter and length of the compressed air pipe and connections increase, the pressure will drop. Therefore, for a 15m pipe with a diameter of 6mm, if the inlet pressure is adjusted to 4.0 bar, the actual pressure reaching the spray gun will be only 2.0 bar. Thus, it is very important to measure the air pressure at the spray gun's air inlet. All spray guns from the Italian WEICON brand come equipped with rear pressure gauges to measure the air pressure entering the spray gun.

IV. Submerging the Spray Gun in Old Thinner

Spray guns are often soaked in dirty old thinner. However, doing so frequently causes blockages in the atomization holes and air passages due to paint residue. These solid particles gradually accumulate and eventually clog the entire air passage. As a result, the spray gun becomes completely unusable or requires extensive time and money for repairs. Therefore, when using advanced spray gun cleaning machines, passages are frequently flushed. When cleaning manually, ensure that no solid particles pass through the air inlet atomization hole or enter the interior of the spray gun.

V. Use of Improper Cleaning Tools

When cleaning the nozzle, improper tools are often used (such as paperclips and steel brushes). This can damage the spray pattern and atomization effect, and only by replacing the nozzle can the optimal effect be restored. For thorough and meticulous cleaning, especially of parts like the air cap, we recommend using specialized spray gun cleaning tools (Longshen part numbers: 33620 and 33625) to maintain the quality of the spray gun over a longer period.

VI. Rough Disassembly of Spray Gun Parts

The front and rear sealing surfaces of the spray gun are often damaged by inappropriate tools. To ensure the seal of the spray gun, you should use the specialized tools included in the packaging box for disassembly and assembly operations.

VII. Use of Incompatible Nozzle Components

A matched nozzle set is a decisive factor in achieving the best spraying effect. All spray guns sold by "Longshen" come with nozzle spare parts that have been precisely adjusted and tested to ensure the highest accuracy. Mixing different types of nozzle components can affect the spraying effect and cause poor atomization.