4
OPERATING INSTRUCTIONS
Paint Preparation
1. Thin paint according to paint can instructions. Be certain to use a thinner which is compatible
with paint used. If no thinning instructions are given, a general rule of thumb is 5 to 15%
thinners. (fine finishes up to 35%)
2. Stir paint completely and strain if impurities are seen. The suction tube screen will strain out any
remaining impurities.
3. Use the viscosity cup to measure paint as follows:
Choosing the Correct Nozzle
1. Nozzle size is very important for achieving perfect paint atomization and maintaining a smooth
operating spray gun.
2. First prepare the paint, and then measure the paint’s viscosity as follows:
a) Submerge the Lemmer Viscosity cup in the paint.
b) Lift the cup out of the paint and begin timing.
c) Stop timing when the steady paint stream is first broken.
d) The time recorded is the paint’s viscosity. Should this viscosity
exceed 100 seconds, thin further until 80 - 100 seconds is reached.
3. Now read the nozzle chart and choose the “general use” nozzle which lists the viscosity range
your material falls into. Choice of a round spray or flat spray nozzle is dependent on your
preference. The other round spray nozzles listed are used for more specific spray applications
where “fine tuning” is necessary. Note: The smaller the nozzle size; the smaller the spray
pattern is, the less the volume is, and the thinner the paint must be.
Example: A latex paint was thinned and its viscosity came to 90 seconds. The chart suggests
either an .8mm round spray nozzle or a BLACK flat spray nozzle for this application.
4. This nozzle chart has been made as accurately as possible. Not all paints will exactly comply
due to paint ingredient variations. However, it is an excellent starting point for learning the
basics of airless spray painting
Round Spray Nozzle Flat Spray Nozzle
NOZZLE CHART
ROUND SPRAY
NOZZLE
.4mm
.5mm
.6mm
.7mm
.8mm
1.0mm
PAINT TO BE SPRAYED
THIN PAINTS - lacquer, varnish,
urethane, stains, automotive paints,
industrial enamel & primer, oil paints,
dye, ink and other thin liquids.
general use nozzle for thin paints
THICK PAINTS - latex, oil paint, stains,
(and glue - round nozzle only).
general use nozzle for thick paints
FLAT SPRAY
NOZZLE
BLUE
BLUE
BLUE
BLACK
BLACK
BLACK
CORRECT
VISCOSITY
10 - 15 sec.
10 - 20 sec.
10 - 35 sec.
35 - 45 sec.
35 - 100 sec.
65 - 100 sec.
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