Why does my Graco spray gun spit?

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People use Graco spray guns for various paint jobs, including automotive work. They’re renowned for their accuracy and consistency in delivering the right paint wherever needed. But sometimes, they can have issues while spraying. One common problem is when your Graco spray gun begins to spit out paint instead of applying a smooth coating. If this happens, there are a few different possible causes.

Understanding the Graco Spray Gun

The first step to rectifying a graco contractor gun rebuild kit is understanding how this type of gun works. If it’s spitting out paint, this knowledge becomes crucial. A Graco spray gun has three main components: an air cap, a fluid nozzle, and an air regulator. The air cap directs the airflow to atomize the paint and create a consistent coating. The fluid nozzle determines the spray’s pattern and the amount of color that comes out. The air regulator adjusts the pressure to deliver a constant volume of liquid.

Common Causes

1. Over-thinning the Paint:

If the paint has been over-thinned, it won’t atomize and spray properly. It can lead to spitting or splattering of the paint. Mix the paint to its manufacturer’s specifications before use to fix this issue.

2. Clogged Nozzle:

A clogged nozzle is another common cause of spitting when using a Graco spray gun. To fix this issue, clean the nozzle before and after each coat to ensure no paint has built up inside.

3. Air Pressure Settings:

Adjusting the air pressure settings on your spray gun can also affect its spraying performance. If the air pressure is set too high, it can cause the paint to spit. To fix this issue, lower the air pressure settings until you find the right balance for your project.

4. Worn or Damaged Parts

Sometimes, the cause of your Graco spray gun spitting can be due to worn or damaged parts. Inspect all components and replace any worn or damaged pieces before use.

Troubleshooting and Solutions

Once you’ve identified the cause of your graco contractor gun rebuild kit, a few ways exist to resolve the issue. Make sure to read and follow all instructions in the user manual that came with your gun to ensure proper use.


Regular cleaning is essential for maintaining a functioning Graco spray gun. Make sure to clean the nozzle and other components after each use. Additionally, perform cleaning whenever you encounter any issues with spraying.

2. Adjust Air Pressure:

If your Graco sprays gun spits due to air pressure settings, adjust it accordingly. Keep trying until the air pressure works well for your project. Try out different settings while spraying on paper or cardboard. Keep experimenting until you find the right one.

3. Replace Parts:

Replace worn or damaged parts as soon as possible to prevent further damage to your spray gun. Make sure to use only genuine Graco replacement parts for the best results.

Step-by-Step Inspection

To ensure your Graco spray gun functions well, conduct a step-by-step inspection. It includes:

  • Inspect the air cap for any wear or damage.
  • Checking the fluid nozzle for any blockages or wear and tear.
  • Adjust the air regulator to ensure it’s set to the correct pressure.
  • Cleaning all gun components, including the nozzle and air cap.
  • Testing a few practice sprays onto a paper before beginning your project.

Using Correct Paint and Thinners

Use the correct paint and thinners for your Graco spray gun. If you’re using solvent-based paint or thinner, choose one designed with a Graco spray gun. It will help ensure that your painted finishes are even and consistent.

Best Practices for Preventing Spitting

Once you’ve resolved the issue of your graco contractor gun rebuild kit spitting issue, follow a few best practices to maintain its proper functioning. Clean the nozzle and other components after each use and whenever a problem arises. Keep up with regular maintenance, such as checking for worn parts and adjusting air pressure settings as needed. Only use the correct paint and thinners for your spray gun to ensure consistent results.

Safety Precautions

Safety precautions are essential as well. When spraying paint, wear appropriate protective gear, such as a face shield or respirator. Keep the spray gun away from children and pets to ensure their safety. Following these tips will keep your spray gun running and prevent it from spitting out the paint again.


Spitting from a Graco spray gun can result in various issues. These include over-thinning paint, a clogged nozzle, and worn or damaged parts. To solve the problem, first, understand how your Graco spray gun works. Next, inspect all components for signs of wear or damage. It’s also essential to use the correct paint for your Graco spray gun and clean all parts. By following these steps and best practices, you’ll ensure your spray gun performs at its best.

Cary Grant
Cary Grant
Cary Grant is a renowned author with a passion for writing about diverse topics, including Business, Services, and Press Releases. With a flair for words and a keen understanding of industry trends, Cary's writings are known for their clarity, insight, and ability to engage readers from all walks of life. Cary Grant's expertise lies in the realm of business mastery. Through his compelling and well-researched publications, he navigates readers through the complexities of entrepreneurship and corporate success. His writings encompass a wide range of topics, from startup guidance and effective leadership principles to scaling businesses and exploring market trends. When it comes to service-based industries, Cary Grant stands as a leading authority. Drawing from his extensive experience in service-oriented sectors, he delves into the intricacies of service design, customer experience, and brand differentiation. Cary's unique approach emphasizes creativity and adaptability, enabling businesses to thrive in dynamic market environments.