Each air cap set includes a fluid nozzle, needle, and air cap. It’s essential that the fluid nozzle and needle match in size, while the air cap can be adjusted one size up or down to fine-tune atomization. Factors like material viscosity, ambient conditions, and desired finish quality may influence your choice. It’s often beneficial to experiment with different air cap sizes to achieve the best results for your specific project. 

For a more detailed overview and visual guide, you can refer to the Fuji Spray Air Cap Quick Reference Sheet.

• 0.8 mm:  Ideal for ultra-fine applications such as inks, dyes, and touch-up work. Best suited for artists or detailed projects using the GXPC or Sunless spray guns. 
• 1.0 mm:  Perfect for fine finishing tasks, including water-based lacquers, sealers, and stains. This is a versatile choice for most clear finishes. 
• 1.3 mm:  Offers a slightly higher output, making it suitable for automotive enamels, catalyzed lacquers, and latex paints on cabinetry and trim. 
• 1.5 mm:  Provides medium output, ideal for spraying walls, ceilings, and larger surfaces with materials like primers and oil-based paints. 
• 1.8 mm:  Designed for high output applications, including thick coatings like epoxy, adhesives, and multi-fleck paints. 
• 2.0 mm and 2.5 mm:  These sizes are for very high output needs, suitable for industrial primers, texture coatings, and heavy latex applications on large surfaces.

Fuji Spray T-Model and M-Model guns come with a 1.3 mm air cap set. The G-XPC gun comes with a 1.4 mm air cap set.