Understanding Cavity Wax Application

12May 2019

10/05/2019 | Reshma Sinha

The need:

As important Cavity protection is for one’s dental health, same it is for a vehicle’s healthy life cycle. A vehicle body has several cavities, that might allow corrosive media such as water to enter the body. Protecting internal metal parts of vehicles from rust and corrosion has been a challenge for many manufacturers, due to the odd geometry of vehicle parts.

Though car bodies, undergo several coating processes in a paint shop, the coating material does not reach the cavities inside the car body.

The solution:

To make them corrosion resistant, layers of wax are applied inside the interiors of the parts, which is referred to as cavity wax application. Cavity wax provides a barrier to corrosive media such as salt, dirt, dust and humidity.

Each vehicle has around 60 to 70 specifically designed holes across the body – on the rocker panel, under the doors, in the hood, wheels, trunk and so on. As the last process in the paint shop after coating, liquid wax is sprayed into each of these holes using lean guns that respectively fit to each opening.

Technologies in use

Cavity protection can be carried out manually, using robots or statically with automated systems.

In a manual system, wax is applied manually by an operator using a gun usually with a specially designed nozzle for each hole. Some of these systems apply automation to eliminate operator error and make the system smart enough to identify the right nozzle for the right hole. The spray gun is attached to a device that recognizes which nozzle to use and which hole to spray in. The operator must change nozzles for different access points. The nozzle design gives a well distributed spray inside each cavity.

Robotic wax application systems are also available, offering better cycle time than the manual, with advantages of less waste and better quality. However robotic systems can be very expensive and further need a high maintenance.

For underbody cavities, an intermediate solution is a static automated system featuring fixed nozzles that penetrate all the underbody cavities. With reduced labour requirements, faster cycle time and being more economical as compared to robots, these systems offer all the advantages that a robotic system offers except the flexibility of using it for different car bodies. A static system is designed only specific to a certain car model.

Another wax application technology called flooding is also used but only on floodable car bodies. In this method, heated flooding wax is pushed into the cavities of the car body with nozzles. The car body is then lifted and tilted, to allow the wax to further spread across the cavities. Excessive wax is collected in a tank for reuse. However, this method utilizes more amount of wax than other automated systems.

What must you look for in a Cavity wax system?

  • Optimum utilization of wax.
  • Faster Cycle time.
  • An economical system that would pay back faster.
  • Ease of maintenance.

Patvin’s solutions for Cavity wax application

Patvin’s provides a comprehensive turnkey solution for cavity wax, delivering maximum performance and increased efficiency. We use our versatile expertise to configure a customized system for your car body. 

Read more

Get in Touch

Thank You!

Our team will contact you shortly.

Our Projects

Case Studies

The experience gained over the years and the consistent drive for technical innovations and improvements have helped to attain the apex in offering innovative solutions to diverse global markets.

View All Projects
turnkey solutions

Turnkey Projects

Patvin offers Turnkey solutions for fluid handling systems, primarily, Paint Circulation,...

Read More

System Refurbishment

If your existing system no longer meets your application requirements, you might probably...

Read More
service and AMC icon

Service & AMC

We have an extensive and trained service network throughout the country with staff positi...

Read More
industrial spare parts

Spare Parts

Extend the life of your equipment with our timely service and original parts. We hold an impres...

Read More
customer experience centre

Customer Experience Centre

Our state-of-art laboratory ensures that system requirements and customer demands are met...

Read More
patvin training


We understand that in most cases, the delivery of a machine is just the beginning of an i...

Read More

Get Solutions For All Industries

Consult our technical team for an expert solution to your need.

Contact Us