News Updates

Polyurethane Waterproofing Sprayer: Operating Tips for High-Pressure Airless Sprayers – Multi-Function Waterproofing Sprayer

Release Date:

Aug 18,2020

1. Preparations Before Coating The spray gun and related equipment should be thoroughly cleaned, and the polyurethane waterproofing sprayer—specifically, the high-pressure airless sprayer—should be properly maintained and in good working order. Verify that the spray gun produces an ideal spray pattern: [an ideal spray is symmetrical, evenly atomized, with sharp edges, and only a minimal amount of paint mist beyond the spray edge]. Additionally, ensure that the air compressor’s capacity meets the specifications outlined in the equipment manual. For example, the AQ6C/AQ6K airless sprayers have an air consumption rate of 300–2,500 L/min and should be paired with an air compressor rated at 1.6–2.

One: Preparation Before Painting

The spray gun and related equipment should be thoroughly cleaned. Polyurethane waterproofing sprayer: operating tips for high-pressure airless sprayers. - Multi-functional waterproof spraying machine 。 And is in normal working condition. Check whether the spray gun produces the desired spray pattern. [ An ideal spray pattern is symmetrical, with uniform atomization and well-defined edges, and beyond the spray edge, only a minimal number of paint mist particles should be present. ] , the capacity of the configured air compressor shall comply with the requirements specified in the equipment manual. For example, AQ6C / AQ6K The air consumption of the airless sprayer is 300-2500 L/min , should be equipped with 1.6-2.5 cubic meter or 2.5 A cubic-meter air compressor. To ensure adequate air intake, the inner diameter of the air compressor’s discharge pipe and the air hose connected to the coating machine’s inlet shall be no smaller than the diameter of the inlet pipe specified in this manual.

Two : Spray pressure

Conditions for achieving appropriate atomization pressure: the minimum atomization pressure required for ideal liquid atomization; therefore, when adjusting the pressure, the following principle should be followed: “ The spray pattern is good, and the pressure is set correctly. ” [ The pressure should also be as low as possible. ] Excessive pressure does not improve coating quality; it only shortens equipment life, increases nozzle wear, and causes paint rebound, leading to paint waste and air pollution.

Three : Spraying Techniques

1. Explanation

Answer: The gun should move before the trigger.

B : Maintain a consistent distance between the spray gun and the workpiece—neither too far nor too close.

C : During the spraying process, the spray gun should be moved at a constant speed.

D When spraying the same workpiece, the starting point of the first spray pass should be the same.

E The workpiece surface shall be coated with wet paint.

F : The overlap ratio of adjacent spray passes remains constant.

G : For the same workpiece, the number of painting coats should remain consistent.

2. Spray gun distance

Answer: The distance between the spray gun and the workpiece is approximately: for conventional air atomization, it is approximately 15CM-20CM； 30CM-38CM Suitable for airless spray atomization.

B To apply a wetter, thicker coat of paint, hold the spray gun closer.

C To achieve a dry, light-colored, and thinner coating, pull the spray gun farther away.

3. Spraying stroke

Answer: The spray gun’s travel path is parallel to the workpiece surface.

B The spray gun should be held perpendicular to the workpiece surface; otherwise, paint will be wasted.

C : Do not move the spray gun in an arc; instead, rely on the operator to move their forearm and shoulder, not just the wrist.

D : Adjacent spray lines shall have an overlap. For air‑atomized spraying, the overlap shall be 50 %, for airless spraying, the overlap is 25 %.

E When the coating thickness is highly uniform, a cross-spray technique should be employed, with vertical spraying performed first.

F When spraying in an outdoor, windy environment, pay attention to the wind direction: keep unpainted surfaces downwind so that overspray is redirected onto those surfaces.

These basic skills are provided for inspiration only. Due to the significant differences between the workpiece and the coating, users can determine their own spraying techniques based on actual conditions and in conjunction with these fundamental principles.

Polyurethane Waterproofing Sprayer: What Should You Consider When Choosing a High-Pressure Airless Sprayer? – Multi‑Functional Waterproofing Sprayer

Polyurethane Waterproofing Sprayer: How Can a High-Pressure Airless Sprayer Help Cut Costs? – Multi‑Functional Waterproofing Sprayer