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Material Reduction/Projector Set Chart
Before spraying, the material being used must be thinned with an appropriate solvent and the proper projector set must be installed. It is
always best to follow the material manufacturers recommendations and thinning procedures.
There are two simple methods of measuring the proper thickness of a material:
1. Dip a paint stick into the material and remove it, watching carefully as the material runs off. When the material begins to form drops, the
drops should fall about 1 second apart.
2. Use a viscosity cup (P/N 0153165). Dip the cup into the material and remove it. Use a watch or clock to time how long the material drains
from the cup in a continuous stream. Once the continuous stream breaks, stop timing and refer to the table below. Add the appropriate
solvent and continue testing until the proper thickness is reached for the type of material you are using.
Material
% of reduction
Time
Solvent
Projector Set
Latex
20-25%
30-35 sec.
Water
5
Oil
10-20%
20-30 sec.
Mineral Spirits
4
Epoxy
1-10%
30-35 sec.
Mfg. Recommendations
5
Clear wood finish
Full strength
NA
Mfg. Recommendations
4
Varnish
Mfg. Recommendations
NA
Naphtha
3
Polyurethane
10%
18-22 sec.
M.E.K.
3
Sealer
Full strength
NA
Mineral spirits
3
Oil-based primer
15-20%
30-35
Mineral spirits
4
Fast-dry enamel
25%
20-25
Mineral spirits
4
Stain
Full strength
NA
Mfg. Recommendations
3
Metal primer
15%
25-30 sec.
Mineral spirits
4
Industrial enamel
15%
30-35 sec.
Mineral spirits
4
Aluminum paint
Full strength
NA
Mineral spirits
4
Lacquer sealer
Mfg. Recommendations
18-22 sec.
Lacquer thinner
3
Lacquer
50%
18-22 sec.
Lacquer thinner
3
Problem
A. Little or no paint flow
B. Paint leaking
C. Paint is backing up past the
check valve
D. Poor spray pattern
E. Pulsating spray
F. Pattern is heavy in the middle
G. Gun spitting paint
H. Paint build up on the air cap
I. Too much overspray
Cause
1. Dried paint blocking fluid nozzle
2. No air pressure in paint cup or pot
3. Check valve in air tube plugged
4. No fluid pressure
5. Blockage in material hose
1. Improper size needle or nozzle
2. Damaged needle or nozzle
3. Loose nozzle
4. Loose packing nut
5. Needle not closing properly
1. Gun is being tilted too much when it is not
spraying
2. Check valve leaks
1. Air holes in air cap ears are clogged
2. Nozzle is clogged
3. Damaged nozzle or needle
1. Loose or damaged packing
1. Too much fluid pressure
1. Valve in air tube is not operating properly
2. Material too thick
3. Projector set is too small.
1. Improper adjustment of cap
1. Air pressure too high
2. Material too thin
3. Spray gun too far from surface
Solution
1. Disassemble and clean
2. Inspect air tube, cup or pot gasket, clean or replace.
3. Clean or replace the check valve assembly
4. Check material supply
5. Clean by flushing with solvent
1. Replace
2. Replace
3. Tighten
4. Tighten
5. a) Loosen packing nut
b) Replace needle spring
c) Remove dried paint from needle
1. Tilt the gun only when spraying
2. Clean or replace the check valve
1. Remove and clean air holes
2. Clean with appropriate solvent
3. Remove and replace
1. Tighten or replace
1. Reduce pressure
1. Replace valve assembly
2. Thin material
3. Install the proper projector set.
1. Adjust the air cap properly so that paint flows freely
through the cap
1. Reduce air pressure
2. Add unthinned paint
3. Move closer
Troubleshooting
