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307-724 15
APPLICATION METHODS
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 of
f 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.
Fig 15–1
RIGHT
WRONG
0072
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.
Fig 15–2
OVERLAP EACH STROKE 50%
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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
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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.
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.