Best Graco Spray Tips for Interior Walls and Paint Types

How does the orifice size of a spray tip affect the finish quality on drywall?

The orifice size dictates the volume of paint passing through the tip, essentially determining how much material hits the drywall per second. A smaller orifice, such as a 0.013, forces a more controlled, atomized spray that results in a smoother, glass-like finish on smooth-taped drywall. Conversely, a larger orifice like a 0.019 delivers more paint, which is better suited for heavy-textured walls where you need to fill deep crevices quickly.

However, orifice size is not the only factor. If you use a 0.017 tip with a thin, watery paint, the finish will likely sag or run because the tip delivers too much volume for the paint's viscosity. The nuance here is that speed must match the orifice; if you choose a larger opening, you must increase your hand speed proportionally to maintain a uniform mil thickness across the surface.

What is the difference between a standard airless tip and a Fine Finish Low Pressure (FFLP) tip?

FFLP tips operate at significantly lower pressures than standard tips, allowing for better control and less bounce-back during application.

Use these pressure figures to adjust your sprayer dial downward when switching to FFLP, as running them at full pressure will prematurely erode the orifice.

Which fan width is most appropriate for painting residential interior walls?

A 10-inch fan width is the industry standard for residential interior walls because it balances coverage speed with the ability to manage overlap.

• 10-inch width: This size covers a significant area in one pass, minimizing the number of vertical strokes required for an eight-foot wall.
• 8-inch width: This is better for narrow hallways or small closets where a wider fan would result in excessive paint hitting adjacent surfaces.
• 12-inch width: Use this only for large, open-concept spaces with high ceilings, as it requires steady technique to avoid thin spots at the edges.
• Overlap technique: Regardless of the width, always aim for a 50 percent overlap of the previous pass to make sure a consistent, streak-free coat.

How do you determine the correct tip size based on the viscosity of the paint being used?

You select a tip based on viscosity by matching the orifice size to the thickness of the coating, where thicker paints require larger openings to prevent clogging.

1. Check the technical data sheet: Look for the manufacturer's recommended nozzle size, which is usually listed in the application section.
2. Perform a flow test: If the paint is thick, start with a 0.017; if it struggles to atomize, move up to a 0.019.
3. Thin the medium: If you prefer a smaller tip for a finer finish, add small amounts of water or thinner until the paint flows through the tip without spitting.
4. Monitor the spray pattern: A narrow, uneven tail indicates the paint is too thick for the current orifice.
5. Adjust pressure: Increase pressure slightly before swapping to a larger tip to see if atomization improves.

What are the signs that a spray tip has become worn and needs to be replaced?

A worn spray tip is identifiable by a loss of pattern shape and a noticeable increase in the amount of paint consumed during a job.

• Tails: These appear as heavy, dark lines on the edges of your spray pattern, indicating the orifice has worn into an oval shape.
• Pattern size: A tip that has widened over time will produce a fan that is significantly larger than its original rating, leading to thin coverage.
• Paint volume: You will notice you are emptying your hopper or bucket faster than usual because the worn orifice allows more fluid to pass through.
• Atomization: A worn tip fails to break the paint into fine droplets, resulting in a coarse, pebbly texture on the wall surface.

How does the spray tip angle influence the overlap pattern during wall application?

The spray tip angle determines the fan width, and holding the gun perpendicular to the wall makes sure that the paint is distributed evenly across the entire width of the pattern. Maintaining a consistent distance of 10 to 12 inches from the surface is necessary to keep the fan width uniform. A lot of people assume that tilting the gun at an angle helps reach corners better, but this actually creates a lopsided fan where one side of the stroke receives significantly more paint than the other, leading to inevitable drips and uneven drying.

Are there specific tip recommendations for applying water-based primers versus topcoats?

Primers generally have a higher solids content than finish paints, necessitating a slightly larger orifice to prevent clogging and make sure a uniform base layer.

Select the larger orifice for primers to make sure the high-build properties of the product are applied correctly without straining the pump.

What techniques should be used to prevent paint buildup and spitting at the tip?

Yes, you can prevent spitting by ensuring your gun filter mesh is clean and matched to the tip size, such as using a 60-mesh filter for a 0.015 tip. Always trigger the gun fully and decisively to avoid partial atomization, which is the primary cause of buildup at the tip.