What nozzle size range is common for basecoat application and why?

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Nozzle size controls how finely the paint is broken up into droplets and how much material is laid down with each pass. For basecoat, you want a spray that is fine enough to lay color evenly without heavy texture, but not so small that pigments clog the nozzle or you struggle to get enough material to cover a panel.

A range of about 1.2–1.4 mm is ideal because it produces good atomization and a smooth, even film across common basecoat formulations. This size balances control and coverage: it reduces the risk of orange peel and runs while still allowing the pigment particles to disperse evenly. Using a much larger nozzle tends to lay down too much material at once, increasing the chance of runs and heavy texture; a much smaller nozzle can clog more easily with pigmented bases and slow application. In practice, this range is widely used with standard reducers and typical environmental conditions to achieve consistent, uniform basecoat coverage.