So, what type of nozzle setups should you use for your spray gun? Actually, you’ll achieve the best results when you refer to the paint manufacturer’s technical data sheets for that particular product you’re spraying. There are many nozzles that you can find, but each nozzle has been prepared to meet the features of the best needle nozzle combination for each product.
A general rule of thumb is:
- When you use a nozzle size of 1.7 to 2.2, heavy-bodied primers and primer surfaces will work best on it.
- Basecoats should be sprayed with a 1.4 to 1.6 nozzle.
- Clear coats should be sprayed with a 1.3 to 1.7 nozzle.
- Sealers and single-stage urethanes should be sprayed with 1.4 to 1.6 nozzles.
That is the general rule of thumb and many painters choose to go against the norm and are able to produce outstanding results from unorthodox methods.
Generally, you should go down in nozzle size to break the material down into smaller particles to get a smoother finish, when you have a high-solids clear coat or single-stage urethane. You should go down in nozzle size to break the material down into smaller particles to get a smoother finish. However, some spray gun manufacturers have gone against this rule and gone up in size. So, be sure to refer to the gun manufacturer’s recommendation as well as to the recommendation from the paint company.
Primer surfaces will require a much larger fluid nozzle. No material is deposited on the repair area as thick primer surfaces won’t go through a small fluid nozzle. In fact, some painters have complaint that the primer was spraying dry and adhesion was poor. This is because his body work wasn’t being covered and the primer was flaking off, even though he already uses a very high-building product. The reason is because he uses 1.3 fluid nozzles while in reality, he should at least use a 1.7 nozzle. This is what will happen when you don’t study your product very well.