8
GENERAL SPRAY INSTRUCTIONS
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 pressures can increase overspray,
reduce transfer efficiency, and with some materials, result
in poor finish quality from dry spray. Atomizing air pres-
sures should not exceed 10 psi. See table on page 5, dia-
gram on this page and Regulatory Note on page 9.
Generally use 30 - 35 psi at gun inlet (see below).
Unusually heavy, difficult to atomize materials may
require up to 50 psi air at gun head.
SPRAY TECHNIQUE
The first requirement for a good resultant finish is the
proper handling of the gun. The gun should be held per-
pendicular to the surface being covered and moved paral-
lel 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 uni-
form finish.
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. See page 3 regarding installation of extractors.
Atomizing pressure must be set to allow for the drop in air pressure between the
regulator and the spray gun.
Approx.
5 1/2 psi
at Nozzle
Approx.
9 psi
at Nozzle
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.
hose causes a drop
of 12 psi between
the air supply and
the gun. For this
reason we recommend
the use of 5/16" hose.
1/4"
5/16"
Cross section view showing comparison of
inside hose diameters (actual size). 60 lbs
regulated pressure.
HOSE RECOMMENDATION
With 60 psi applied at air supply:
RECOMMENDED
NOT RECOMMENDED
6 to 12 inches
Coating should be even
and wet when spraying
Summary of Contents for M1-G HVLP
Page 10: ...10 NOTES ...
Page 11: ...NOTES 11 ...
