4
To reduce overspray and obtain maximum efficiency,
always spray with the lowest possible fluid/air pressure
that produces an acceptable spray pattern.
Excessive atomizing air pressure can increase overspray,
reduce transfer efficiency and with some materials,
result in poor finish quality from dry spray.
Generally use 30 to 35 psi air at gun inlet (see below).
Unusually heavy, difficult to atomize materials may
require up to 50 psi at gun inlet.
GENERAL SPRAY INSTRUCTIONS
The first requirement for a good resultant finish is the
proper handling of the gun. The gun should be held
perpendicular to the surface being covered and moved
parallel with it. The stroke should be started before the
trigger is pulled and the trigger should be released before
the stroke is ended. This gives accurate control of the
gun and material.
The distance between gun and surface should be 6 to
10 inches depending on material and atomizing pressure.
The material deposited should always be even and wet.
Lap each stroke over the preceding stroke to obtain a
uniform finish.
SPRAY TECHNIQUE
OIL AND WATER EXTRACTOR IS IMPORTANT
Achieving a fine spray finish without the use of a good oil and water extractor
is virtually impossible.
A regulator/extractor serves a double purpose. It eliminates blistering and
spotting by keeping air free of oil and water and it gives precise air pressure
control at the gun.
Atomizing pressure must be set to allow for the drop in air pressure between
the regulator and the spray gun.
OIL AND WATER EXTRACTOR
HOSE SIZE RECOMMENDATIONS WITH 60 PSI APPLIED AT AIR SUPPLY
Only 34 psi
at gun inlet
25 feet of
1/4" I.D. hose
causes a drop of
26 psi between
the air supply
and the gun.
48 psi at gun inlet
25 feet of 5/16" I.D.
causes a drop of 12 psi
between the air supply
and the gun. For this
reason we recommend
the use of 5/16" hose.
Not
Recommended
1/4"
5/16"
Cross section view showing comparison
of inside diameter of air hose (actual
size). 60 lbs. regulated pressure.
Recommended
Coating should be even
and wet when spraying
Coating will
be light at
this point
Coating will
be heavy
at this point
Start
stroke
Air
Supply
Air to Spray Gun
atomizing pressure
Pull
trigger
Release
trigger
End of
stroke
RIGHT WRONG
TRAVEL OF GUN
6 to 12 inches
Air
Regulator
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