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VISCOSITY GUIDE
To test the viscosity of the paint material, fill the viscosity cup to the brim
and time how long it takes for the liquid to empty out through the hole. We
recommend you experiment to find the ideal viscosity for your application
and record the information for the next time. The Fuji 3050 Viscosity Cup is
made to the exact same specs as the Ford #4 Cup (but not certified).
Always check with the manufacturer of the coating for assistance in
thinning for spraying. If their product is only designed to be brushed, they
may not be too helpful. But remember that any type of coating can be
sprayed if it is thinned correctly and you have installed the ideal aircap set.
The chart below illustrates how many SECONDS it should take for the
material to flow out of the viscosity cup. This is only an approximate guide.
Auto Cellulose 18 - 20
Primers
30 - 40
Lacquers
18 - 20
Sanding Sealers
20 - 22
Enamels
20 - 25
Stains
Undiluted
Latex
20 - 30
Creosote
Undiluted
Oil-based
20 - 25
Polyurethanes
20 - 25
We suggest thinning around 25% to begin with but this may contravene the
air quality control laws for your location. The solvent used for thinning is
usually the solvent mentioned on the can (instructions for ‘cleaning the
brushes’). However, please check with the coatings manufacturer.
HVLP spraying is more friendly to the environment than most methods of
spraying. It reduces appreciably the amount of unnecessary misting and
fogging (overspray) associated with high-pressure spraying. Spraying with
Nitrocellulose lacquer can be
hazardous.
The lacquer, fumes and
overspray are toxic, flammable and explosive.
If spraying must be done
inside an enclosed area,
ventilate well.
Spray close to an open window or
door and situate a fan to draw out the fumes (an explosion-proof motor and
explosion proof lighting will be necessary). PLEASE CHECK WITH THE
LOCAL AUTHORITY HAVING JURISDICTION ON THIS MATTER.
CLEANING
To clean the gun after each use, empty all paint from the cup. Use a solvent
soaked rag to clean the residue in the cup. Then, spray some clean
solvent through the gun into a clean rag (to avoid filling the room with
unnecessary spray) or a bucket. Repeat until the inside of the fluid pas-
sages in the gun, metal fluid tube etc. are clean. Use the wet rag to wipe off
the aircap and tip of the fluid nozzle. The Aircap can be soaked in thinner.
Do not restrict the fluid nozzle when cleaning - this will drive thinned paint
up the pressure tube and into the spraygun which is undersirable.
SPRAYGUN PROBLEMS
NO PAINT (OR VERY LITTLE PAINT)
THIS IS THE MOST COMMON PROBLEM ENCOUNTERED
-
The air passing through the plastic tube 2024 to pressurize the cup is
blocked. This means that either the tube itself, the check valve, or one of
the two nipples 2023 is blocked. A pipe cleaner can be used for cleaning
the hole in the nipple. Please see more info on the pressure tube’ -
Page 5
•
Pressurizing tube and/or nipples are blocked - COMMON
•
The cup is not tightened down sufficiently by the quick-release
lever or the cup gasket 2036 is worn and leaking air
•
The cup is empty
•
The metal fluid tube is blocked with paint - rare
•
The fluid coupler is blocked with paint - rare
UNEVEN SPRAY PATTERN
One of the holes in the aircap may be blocked. Or, the paint could be dirty
and is partially blocking the fluid nozzle. Remove the aircap and clean by
soaking in solvent and using the soft bristle brush or a rag. NEVER use
metal objects to clean holes in the aircap.
LEAKAGE
If paint material comes out of the fluid nozzle
without
pulling the trigger...
•
The needle is not seating in the fluid nozzle properly
•
The needle packing may be too tight preventing the needle from
moving
•
Foreign matter could be trapped between the needle and fluid
nozzle
•
The needle or fluid nozzle could be damaged or worn
•
Loose fluid nozzle
•
Wrong nozzle size installed
CUP LEAKS
•
Oil above and below the lever to smooth the lever action
•
Change gasket/diaphragm - oil lever first to check
•
Leak around nipple - use Loctite to seal
•
Leak around side pins - use Loctite to seal
•
Leak through lid - remove nut under lid - use Loctite
