Why Is My Spray Gun Pulsing?

Why is my spray gun not spraying?

Most spraying problems are the result of finish building up at the air nozzle or because a fitting is loose.

If your gun won’t spray correctly, the likely causes and solutions are listed below.

Problem: A dry coat, spitting, or no spray at all.

Cause/Solution: Blocked air vent hole in the cup lid..

How much pressure does a HVLP gun need?

What is HVLP? HVLP, or High-Volume/Low Pressure, uses a high volume of air (typically between 15-26 CFM) delivered at low pressure (10 PSI or less at the air cap) to atomize paint into a soft, low-velocity pattern of particles. In most cases, less than 10 psi is needed in order to atomize.

Why is my HVLP gun leaking?

The spray gun is leaking from the Nozzle This occurs when the Needle Packing Nut is too tight, compressing the Needle Packing too tightly around the Needle. … Remember that the needle packing must be tight enough to prevent any leakage of paint material. It should however, allow the needle to glide smoothly through it.

What causes a paint gun to sputter?

A loose packing nut will cause sputtering. Another cause is a loose fluid nozzle. To properly tighten your needle packing, trigger the needle (with gun off line of course) and tighten the packing nut until the needle won’t seat into the fluid nozzle when released.

How can you tell the difference between HVLP and conventional spray guns?

The high pressures of conventional spray guns turn paint into a finely atomized mist, giving you a thinner, finer application. HVLP spray guns produce a thicker coat due to their lower pressure, producing large droplets.

How do you keep water out of a spray gun?

You must keep water away from entering the paint gun when doing an auto painting. It does not matter what you are painting at the moment, you must prevent all the moisture out of the paint gun. The only way to achieve this is by using a sufficiently designed compressed air mechanism in your painting area.

Why is my airless spray gun spitting paint?

There is spitting from the spray gun. 1. The fluid supply is low or empty. … Air entrapped in the fluid pump of the hose.

Do you need to thin paint for spraying?

It must be diluted or thinned with water to achieve a better consistency. Thinning your paint is most important if you intend to distribute a thin mist of paint, or if you are using a paint spray gun or nozzle. … However, paint thinning is not merely mixing your material with water or thinner.

How do you adjust a spray gun pattern?

To set the fluid adjustment, start by unscrewing the fluid control almost completely. Next, pull the trigger back to the full open position, and screw the fluid control in until you feel a force from the back side of the trigger.

What does 10 psi at the air cap mean?

HVLP air caps are typically rated for a maximum gun inlet pressure to achieve 10 psi at the air cap. For example if 50 psi inlet achieves 10 psi measured at the air cap, then an inlet pressure of 60 psi would exceed 10 psi at the air cap.

Why is my spray gun fluttering?

My gun keeps fluttering like it’s run out of paint but it hasn’t, can you help? This problem occurs when air is being drawn into the fluid passageway. The main cause of this is a loose fluid tip. Re-tighten the tip using the correct spanner.

How much paint is needed to thin a spray gun?

Add ½ cup of water for every gallon of paint. Mix thoroughly. Check the thickness by running the paint through a funnel. If it flows freely through the funnel, you know the paint is thinned enough.

What pressure should I run my spray gun?

When spraying base coat you want to spray at about 26-29 PSI. They way you read this is at your gun, trigger pulled air flowing through and your dial reading 26 psi. When spraying clear coat I like to up the pressure 2-3 psi for a little more atomization and better flow out.

How many coats of clear is too much?

Plan for 2-3 coats. When applying multiple coats (recommended), it’s a good idea to apply the first coat lightly. Doing so helps prevent shrinkage, which causes cracks. All preceding coats should be full and wet!