The recommended setup size for automotive primer spray guns can vary depending on factors such as the type of primer being used, the intended application, and the manufacturer's guidelines. However, I can provide you with some general information on this topic.

Automotive primer spray guns typically use a nozzle size that ranges from around 1.3mm to 1.8mm. The choice of nozzle size depends on the viscosity (thickness) of the primer being sprayed and the desired application technique. Here's a rough guideline:

1. (1.7mm - 1.9mm): Most common size, for application of automotive 1K & 2 K primer fillers, these nozzle sizes provide a good balance between atomisation and coverage, allowing for even application and smooth buildup of the primer filler.

2. (1.0mm - 1.2mm): These nozzle sizes are suitable for spraying, *UV Primers, thinner primers or for fine detail work. They are often used for spot repairs, touch-ups, and smaller areas where a finer spray pattern is needed. *additional UV Pot and UV Cap are required if using with UV Primers.

3. (1.8mm -2.5): Larger nozzle sizes are suitable for thicker primers or high-build primers. They are used when a heavier application is needed, such as for filling imperfections or building up surface layers.

It's important to note that the specific recommendations can vary based on the primer product you are using. Always refer to the manufacturer's guidelines and technical data sheet for the primer to determine the recommended setup size for the spray gun. Additionally, factors like air pressure, spray gun distance from the surface, and technique also play a role in achieving optimal results.

Ultimately, the choice of spray gun setup size depends on the specific requirements of your automotive primer application. It's a good idea to experiment and practice on test panels before applying primer to the actual vehicle to ensure you achieve the desired finish.

The recommended setup size for base coat spray guns can vary depending on factors such as the type of base coat being used, the intended application, and the manufacturer's guidelines.

Automotive Base Coat spray guns typically use a nozzle size that ranges from around 1.2mm to 1.3mm. However other set-up sizes are used in various applications, including industrial coatings, where different requirements and materials may call for a different approach. Below are some examples of Set-up (nozzle size) selections used in different contexts:

1. Set Up Size (1.2mm - 1.3mm): Most common sizes and are often used for spraying waterborne, solvent and low-viscosity base coat paints. They provide finer atomisation and are suitable for achieving smoother and more even color coverage. These sizes are also preferred and recommended for candy, metallic and pearl finishes, as they help prevent overloading the surface with paint particles, which can lead to unevenness, mottling or streaking.

2. Set Up Size (1.0mm - 1.1mm):  typically used for finer applications and specialised painting tasks that require precision and detail. Applications where these set-upe sizes might be used: Fine Detail Work, Touch-Ups and Spot Repairs, Graphics and Artwork, Models, Electronics and other small components.

3. Set Up Size (1.4mm - 2.5mm): Industrial coatings, heavy coatings, corrosion-resistant coatings, industrial flooring coatings, high-volume applications. Larger size allows for thicker coatings, faster coverage, and accommodates specialized requirements.

It's important to note that the choice of nozzle size in industrial coatings is influenced by factors such as the viscosity and composition of the coating material, the desired film thickness, the substrate being coated, and the specific requirements of the application. Always refer to the manufacturer's guidelines and technical data sheets for the specific coating material being used to determine the appropriate nozzle size and other application parameters.