12
Figure 11. - Result of flexing wrist while spraying.
3) Start moving the gun before triggering. To get
smooth overlap and prevent initial paint buildup, start
your stroke movement before pulling the trigger. At
the end of the stroke release the trigger before
stopping. NOTE: To assure uniform paint coverage,
overlap each stroke by 40% - 50%.
4) Intermittent use. If you are spraying and decide to
stop for several minutes, lock the spray gun trigger
and submerge the tip in a container of the appropriate
solvent. This will prevent paint from hardening in the
tiny spray opening and clogging the tip. Be sure to
release the pressure by opening prime valve and
turning the pump off.
WARNING: DO NOT BEGIN SPRAYING BEFORE
READING THIS SECTION AND ALL PREVIOUS
SAFETY INFORMATION.
PAINTING AND TIP SELECTION:
Correct adjustment of pressure and proper tip selection
are crucial to the best spray pattern....
1) In any situation, the lowest pressure that gives an
adequate spray pattern is the best pressure to use. It
will give maximum pump and tip life and produce
minimum overspray.
2) Typically, thicker materials require larger tips and
higher pressures than thinner paints do. Some very
thick paints may require slight thinning (5-10%)
depending upon pump and tip size and application.
Generally, thinning is performed when a good spray
pattern cannot be obtained with an appropriate tip
size at maximum pressure. (see figure 8).
SPRAY PAINTING METHOD:
1) Keep the gun perpendicular to the surface. Always
hold the gun perpendicular to the surface with the tip
approximately 12" from the surface. If held at an
angle (up and down or side to side) paint will build up
unevenly and leave the work splotchy. (See figure 9).
Figure 9. - Right and wrong way to hold spray gun.
2) Move with a smooth arm stroke. Move the gun at a
steady even pace while keeping the gun perpendicu-
lar to the surface. (See figure 10) Do not move the
gun by flexing your wrist. Fanning the gun will cause
excessive overspray and uneven coverage. (See
figure 11).
Figure 10. - Proper way to trigger spray gun.
HINTS FOR AIRLESS SPRAYING
