What are the key points of using a spray gun?
2 Answers
Each spray gun must be firmly held by the operator, with the nozzle aimed at the roughened area. The distance between the gun head and the roughened surface should be 100-150mm, and the angle between the gun and the ground should generally be around 75 degrees. The operator should concentrate and sweep from left to right along the trajectory where the jet contacts the concrete surface, with slight overlap between each row of sweeping to avoid uneven results. Relevant instructions are as follows: 1. Transferring the bin: Before transferring the bin, the spray gun cable should be retracted into the vehicle compartment. The roughening machine should be transported on the bin surface using a gantry crane or other crane with a capacity of over 3 tons. 2. Specialized guidance: The lifting wire rope must be aligned correctly and not tilted, with specialized guidance and suspension. When moving to a new bin surface, the parking position should be appropriate, minimizing the number of transfers for the roughening machine. The parking location should ensure the roughening machine is stable, and the pump should be kept as level as possible.
The key to using a spray gun lies in distance, speed, and angle. Maintain a distance of 6 to 8 inches from the surface to be sprayed—about an arm's length. Too close, and the paint may drip; too far, and the coverage becomes uneven. Move at a steady speed, neither too fast nor too slow, keeping your wrist stable while sweeping back and forth to ensure uniform coverage. Hold the spray gun perpendicular to the surface—avoid tilting, as it leads to uneven paint layers and material waste. The paint dilution ratio must also be precise; follow the product instructions to mix it evenly. Overly thick paint clogs the nozzle, while overly thin paint lacks adhesion. Test the spray pattern on scrap material beforehand and adjust the pressure to avoid excessive atomization. Never neglect cleaning—disassemble the parts immediately after use and clean the nozzle and gun body with solvent to prevent dried paint blockages. For safety, wear a mask and goggles, and work in a well-ventilated area. With practice, you'll master the technique and achieve a smooth, flawless finish.