Spray Tip Selection; Spray Tip Application Recommendations; Spray Techniques; Other Applications - Graco LineLazer GM 3500 Manuel D'instructions

Spray Tip Application Recommendations

Based on 4" wide line and 15 mils of paint
Application 120
Parking Lot Lines
4" wide 217*
6" wide 317*
Long Lines,
4–6" wide
Curbs 417*
* Tips can be used with two guns.
Fig. 14
These spray techniques discuss how to use and adjust
the features of the Line Lazer. You must also consider op-
erator technique, job site conditions and weather.
1. Use water rather than paint to practice spraying tech-
nique and positioning the guns.
2. Be sure the RAC IV Tip Guard is always parallel to
the ground and the "wings" of the spray tip guard face
the front and back of the unit, as shown in Fig. 15.
WARNING
To reduce the risk of a fluid injection injury, always
disengage the remote trigger cable to the gun(s)
and engage the gun trigger safety latch(es) before
moving or adjusting the spray tip guards, guns, or
gun arms. See Page 21.
3. Use the lowest pressure necessary for good atom-
ization. High pressure may cause excessive paint
buildup and overspray.
4. Start moving the Line Lazer before triggering the gun
to prevent a build up of paint at the beginning of the
line. Release the trigger a second before stopping
the Line Lazer. Move at an even rate of speed.
5. Always check your gun adjustments on cardboard or
paper before starting each job. When painting curbs,
paint first in an area that is less frequently seen.
6. Keep in mind that many factors affect the straight-
ness of a line, including uneven surfaces, potholes,
rocks and other debris and a clogged or worn spray
tip. See page 15 for how to clear or change a spray
tip.
7. To minimize the effect of bumps on the spray pattern,
keep the spray tip guard centered with the front
wheel axis.

Spray Tip Selection

Lineal Feet/Minute
(rate at which unit is moved)
144 184 220
LLT–317* 221* 223
317* 321* 323
221* 223
419*
Supplied with the Line Lazer.

Spray Techniques

264 308 352 400
224
325
225 227 228 231
8. The spray tip size and the rate at which you move the
unit affect the coating thickness. Generally, the fast-
er you move the unit, the larger the spray tip orifice
should be. The fan width of the spray tip indicates ap-
proximately how wide the line will be. See the chart
in Fig. 14 for spray tip application recommendations.
9. Position the guns to suit your requirements. See the
section below and pages 17 to 19.
10. Traffic paints may be formulated for air spray, airless
spray or have no formulation description.Generally,
air spray formulas are pre–thinned, and will work well
in the Line Lazer, but there may be more overspray.
Non–air spray formulas tend to deliver more lineal
feet of line per gallon with less overspray, since they
are less easily absorbed into the pavement.
11. If you use fast–draying traffic paint on a hot day, float
compatible solvent on top of the paint to prevent skin
from forming on it.

Line Width Adjustment

Several factors affect line width: vertical distance of the
spray tip to the spraying surface, spray tip fan pattern, us-
ing one or two guns, paint pressure, and a worn or
clogged spray tip.
The typical conditions for a 4 in. (10 cm) wide line are: 317
size Line Lazer Tip (supplied), the gun positioned one
inch from the lowest vertical position, and just enough
pressure to atomize the paint. Depending on the fan pat-
tern of the spray tip, use one gun to paint 2 to 12 in. ( 5
to 30 cm) wide lines, and two guns to paint 12 to 24 in.
(30 to 61 cm) wide lines.
To decrease line width, lower the gun (if possible) or use
a tip with a narrower fan pattern.
To increase line width, raise the gun, or use a tip with a
wider fan pattern, or use two guns.

Other Applications

Sport Court,
2" wide line
Crosswalk,
12" wide line, 1 gun
Airport,
24" wide line, two guns
Stencils
General Stationary
Painting
LLT–213*
621,
623, 625
721
417*, 419*
517