12
308069
Operation
Adjusting the spray pattern and spraying
pressure.
See Fig. 9.
NOTE: If the system is not primed, follow the proce-
dure on page 9.
1.
Set up a large piece of paper or cardboard to
spray on for testing the spray pattern.
2.
Release the trigger safety latch.
3.
Aim the gun at the cardboard and trigger it briefly.
Check the spray pattern. Adjust the air pressure
just until spray from the gun is completely atom-
ized. 3M recommends 80 to 90 psi air pressure at
the air inlet gauge for the best results.
4.
To adjust the direction of the spray pattern, set the
trigger safety latch and loosen the tip guard retain-
ing nut. See Fig. 7. Position the tip guard horizon-
tally for a horizontal pattern or vertically for a
vertical pattern. Retighten the retaining nut.
Practice spraying
Read the spray techniques in Steps 1–5, below and
Figs. 10 and 11, and follow 3M’s recommendations on
application of the masking liquid.
1.
Begin triggering and moving gun just before first
edge of target surface. See Fig. 10.
2.
Keep gun moving horizontally or vertically at a
steady rate.
3.
Release trigger just as you approach other edge of
target surface, but keep gun moving until it has
passed the edge.
4.
Hold the gun perpendicular (at right angles) to the
target surface. Hold the gun an even 12 to 14”
from the target surface. See Fig. 11.
5.
Lap each stroke 50% over the previous stroke to
produce a uniform material thickness.
Fig. 9
SPOTTY
PATTERN
–
INCREASE
PRESSURE
GOOD
FULL
PATTERN
TIP GUARD SHOWN
IN POSITION FOR
VERTICAL PATTERN
7556A
ÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇ
ÇÇÇÇÇÇÇÇ
Fig. 10
CORRECT
WRONG
TARGET
SURFACE
1.
2.
3.
7557A
Fig. 11
LAP EACH STROKE
50% OVER THE
PREVIOUS STROKE
TARGET SURFACE
12 TO 14” INCHES
KEEP GUN
PERPENDICULAR TO
TARGET SURFACE
7558A
