Application Methods - Graco EM 390 Instructions And Parts List

Always hold the gun perpendicular to the work surface
and at an even 12 to 14 in. (300 to 356 mm) from the sur-
face you are spraying. See Fig 15–1.
Begin moving the gun in a horizontal direction 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 work
surface, release the trigger. This method avoids excess
paint buildup at the end of each stroke.
RIGHT
WRONG
Fig 15–1
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 alternately from right to
left and then left to right to get a professional finish.
See Fig 15–2.
OVERLAP EACH STROKE 50%
Fig 15–2

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! Using the lowest pressure necessary to get the
desired paint atomization will help prolong the life of your
sprayer and minimize paint lost by overspray.
Fig 15–3
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 15–3.
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If there is a wind, angle the spray pattern into the wind to
minimize drifting. Paint from the ground to the roof.
Shrubs. Tie back shrubs with rope and stakes. Cover
them with a canvas dropcloth as the painter approaches
the area. Remove the dropcloth as soon as the area is
painted to prevent damage to the shrubs.
Concrete walks. If the walkways will be walked on, cover
them with a canvas dropcloth to avoid slipping. Otherwise
a plastic dropcloth 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 upwind of the surface to
be sprayed. If there is a nearby home, make a protective
barrier by hanging plastic between two long poles.
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