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Wax Application

End-to-end cavity protection solutions achieving optimum utilization of wax. In automotive manufacturing, cavities are coated with wax to effectively protect the car body from corrosion. Cavity wax provides a barrier to corrosive media such as salt, dirt, dust and humidity. Patvin provides a comprehensive turnkey solution for Cavity wax application, comprising of the following:

Wax Feed System

The wax feed system is designed to achieve predefined wax dispense at an application Temperature set value +/- 2 Deg C . A variance above +/- 2 Deg C will call for a Production Halt /warning.

The system mainly comprises of a jacketed tank, pneumatic pump and a cartridge filter.

Temperature control: The Main Function of this system is to maintain the Wax temperature within +/- 2 Deg C. The system incorporates PLC based master control panel which accepts temperature input from PT-100 installed in wax line & controls Hot/Cold water. 

Pipe Network & Distribution: Temperature conditioned wax is circulated throughout the system via high pressure SS 304 pipes. The piping network is designed to ensure smooth flow of material with least/No retention areas. All Wax Pipes are Insulated using ARMAFLEX Insulation of Appropriate thickness to maintain the desired operating temperatures.

Highly-precise metering reduces wax consumption:

A flow meter provides feed Back of precise volume to be dispensed from wax gun. This significantly reduces the required shot volume, and cuts material, cleaning, and disposal costs.


Manual Cavity wax application:

An encoding spray gun is used to manually coat hollow spaces with liquid conserving wax. By actuating the trigger, an electrical pulse is generated and transmitted to the connected control cabinet. The gun has encoder housing which detects magnetically coded nozzles & provides signal to PLC to activate predefined program. Special Nozzles are designed as per contour/cavity to achieve a maximum coverage of wax in the box sections of the vehicles.

The in-house development and manufacture of nozzles allows us to achieve maximum quality for openings and geometries.

All components feature exceptional precision and reliability in continuous operation and can achieve perfect coating results.

Automated Under Body Cavity Wax application:

Our automation system for under body cavity wax, featuring fixed nozzles reduces labour requirements and speeds up the cycle time. The machine aligns itself to the car body using servo driven X-Y assembly allowing the entire under body cavities in one go. The cycle time is approximately 50 secs.

Our Under body cavity wax technology delivers maximum performance and increased efficiency. We use our versatile expertise to configure a customized system for your car body.

Why Use Cavity Wax?

Automobiles experience very harsh environmental conditions and most automotive manufacturers recommend the use of Cavity Wax to prevent corrosion when repairing or replacing panels. This practice helps safeguard the repair structural components that have been welded during the repair process are of special concern as it relates to corrosion for obvious reasons.

Areas of application: For long-lasting protection of areas in vehicle body cavities prone to corrosion. Used for subsequent treatment of existing seals and for restoring corrosion protection after an accident repair.

Is cavity wax an absolute necessity?

Yes. No rust proofing method pays special attention to cavities of the car’s body and the best cavity wax is atomized spray, reaches out to the narrowest places easily and removes all chances of rust. Apart from fighting rust, cavity wax can also protect the vehicle from paint chipping off or any other damage caused through normal wear and tear.

As in any auto body repair process personal protection is a must, remember to select protective eye wear, appropriate gloves, hearing protection, respirator and protective clothing based on your job and exposure assessment.

After completing the repair process and prior to final assembly, determine the location requiring Cavity Wax application, internal areas of the body panels that have been replaced or repaired should be considered. Agitate the aerosol can thoroughly with a minute of shaking to mix the components prior to use, attach the desired accessory extension and actuator if needed to access the areas inside the panel enclosure. If a standard actuator is to be used, simply apply the material to the internal portion of the part ensuring 50% overlap spray pattern and a three coat coverage.

If using the accessories attach the extension tube and actuator by removing the standard actuator and pressing the accessory actuator in place, be sure to direct the actuator in a safe area and away from yourself when doing this.

Mark the extension about 1 inch from the end as a reference. Insert the accessory into the deepest point of the panel cavity and begin spring by depressing the actuator completely, slowly remove the tube until your reference point comes in view, repeat the application of the three times to ensure adequate coverage.

Do not apply Cavity Wax to moving parts, window tracks or exhaust systems.

After applying cavity wax, invert the can cover the nozzle and depress the actuator button, clearing the nozzle of any remaining material. This will ensure proper performance the next time you use the Cavity Wax. After application reassembled the panel is required and wipe off any excess with a VOC compliant surface cleaner.


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