How to know the right tip for your spray:
Choose a tip with an orifice size rated for the paint or coating you’ll be spraying. Light coatings such as lacquers, stains, and enamels require a small tip, while heavier coatings such as texture require larger spray tips. Many paint manufacturers will specify recommended spray tip sizes on the container or product specification sheet.
Size the spray tip according to the tip rating of your sprayer. Make sure that the sprayer can support the tip you are planning to use. If you plan on using multiple spray guns on your job, pick a tip size that matches the multiple gun tip rating of your sprayer.