Application Methods - Graco EM 490 Instructions-Parts List Manual

Hold the gun perpendicular to the surface. Keep the gun
at an even 300–356 mm (12 to 14 in.) from the surface you
are spraying. See Fig 12.
Begin moving the gun horizontally at a steady rate. Start
the spray stroke off the target surface and pull the trigger
as the gun is moving. Then, while the gun is still moving,
and as you approach the other edge of the surface, re-
lease the trigger. This method avoids excess paint buildup
at the end of each stroke.
RIGHT
WRONG
Fig 7–12
Move the gun at a speed that provides a full, wet coating
to be applied without runs or sags. Lap each stroke 50%
over the previous stroke to produce a uniform paint thick-
ness. Spray in a uniform pattern from right to left and then
left to right for a professional finish. See Fig 13.
OVERLAP EACH STROKE 50%
Fig 7–13

APPLICATION METHODS

The best way to control the rate of coverage is with the
gun tip size. A small tip orifice applies less paint. A larger
tip orifice applies more paint. The width of the pattern de-
pends on the fan pattern of the tip you choose.
Do not try to increase coverage by increasing the fluid
pressure! Use the lowest pressure needed for good re-
sults. This prolongs the life of your sprayer and reduces
paint lost by overspray.
For interior corners aim the gun toward the center of the
corner to be sprayed. By dividing the spray pattern this
way, the edges on both sides are sprayed evenly . See
Fig 14.
Fig 7–14
If there is a wind, angle the spray pattern into the wind to
minimize drifting. Paint from the ground to the roof.
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Shrubs. T ie back shrubs with rope and stakes. Cover
them with a dropcloth as the painter approaches the area.
Remove the dropcloth as soon as the area is painted to
prevent damage.
Concrete walks. If the walkways will be walked on, cover
them with a canvas dropcloth to avoid slipping. Otherwise
a plastic cloth can be used.
Electrical outlets and lamps. Protect electrical outlets with
masking tape. Cover lamps with plastic bags secured with
masking tape.
Nearby objects. Move portable objects upwind of the sur-
face to be sprayed. If there is a nearby home, make a pro-
tective barrier by hanging plastic drop cloths between two
long poles.
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