FAQ - Fuji Spray Systems

Author: Ruby

Aug. 12, 2024

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FAQ - Fuji Spray Systems

1. How can I tell which air cap set I should use?

Please refer to our Quick Reference Sheet for guidance to help with your air cap set selection. We advise using your viscosity cup to measure the run time of your finish material. Needles, nozzles, and air caps belonging to each specific size should be kept together.

Click here to get more.

2. How far away should I hold the spray gun?

The Spray Pattern is fan-shaped, so for a larger-sized fan keep your spray gun at a distance of 6&#;-8&#; from the surface. Moving too close will increase bounce back while moving too far away can produce a dry spray. Bounce back occurs when the airflow from the spray gun carries the finish away from the surface you&#;re spraying. The main causes of this will be holding the spray gun too close to the surface while spraying or using too much airflow for turbine spray guns and too much pressure for compressor-driven spray guns. The closer your spray gun to the surface is and the greater the airflow/pressure, the more bounce back you will observe. Dry spray occurs when the material cures before it reaches the surface you&#;re spraying. The most common cause is holding your spray gun too far from the surface. For fast drying finishes, using too much air or too little finish for the airflow can result in a dry spray. Use the pattern control to adjust the width of the fan to the desired size. Don&#;t forget to readjust the fluid control to ensure optimal coverage. When using a small round fan pattern to spray smaller surfaces, move closer to the target.

3. Can I spray walls & ceilings with HVLP?

While HVLP Turbine Systems were designed for fine finishing, thousands of people have used the Fuji Systems to paint walls/ceiling and they are very happy with the results. For better results, choose a paint with lower viscosity and a higher tolerance for dilution. Before you begin, make sure to mask all adjacent surfaces. Thin your paint according to the air cap set you&#;re planning to use. See your quick reference sheet for guidelines. You may need to add slowing agents/dry time extenders such as Floetrol to promote better leveling. It&#;s best to use bottom feed spray guns such as T-70. It will hold more finish and the material cup can be readjusted to ensure proper material intake when spraying ceilings. The cup attached to your gun will require constant refills. When spraying large area&#;s it is recommended to use a 2Qt pressure pot.

4. Is thinning necessary or important with HVLP?

The viscosity of coatings is important. Although we supply a guide, there is often some experimentation involved in arriving at the best viscosity. If a product is thinned too much, there are runs. Too thick and &#;orange peel,&#; or rough finish is the result. When thinning, it is essential to use a reducer that is compatible with the material you are using. It is wise to experiment on a practice piece to ensure that the finish is perfect. Request information from the coatings manufacturer &#; don&#;t forget to mention you are spraying with HVLP equipment. Water-borne lacquers can be applied successfully with HVLP. Some of these products require no thinning whatsoever (but some do). Many of these newer coatings contain a high-solids content of 60% or more, so the turbine must also be powerful enough to handle waterborne products. Several thin wet coats are preferable to one or two thick coats.

5. Can I spray household trim with latex (house paint)?

Yes, HVLP is ideal for this application &#; but you must follow a few general rules in order to achieve a good finish. If you intend on spraying latex emulsion paint (house paint) most of the time, please consider purchasing the more powerful 4-stage turbine systems. To spray latex paints successfully, some rules must be adhered to. The latex should be &#;finish-quality&#; (the best grade). For best results, a latex additive should be used. Additives or extenders are not for thinning &#; it is a product that prevents the paint from drying too quickly &#; in other words, it is a &#;slowing agent&#; &#; it slows the drying process allowing the paint to level more smoothly. You still must thin with water. Thin the latex with water &#; upwards of 20% should be enough. The 1.5mm &#; 1.8mm is preferred for adequate coverage on items like household trim, louver doors, fireplace mantles, cabinets, etc. When spraying latex, be sure to turn the fluid control to limit the paint to a finer spray. This will increase the ratio of air to paint and result in better atomization and a beautiful finish. (Factually speaking, it doesn&#;t increase the ratio of air to paint but does the opposite &#; it allows the air atomizing power to work on less paint, thereby improving the quality of atomization). Spray the paint on &#;wet like a lake&#;. In other words, it must be completely wet in order to flow out nicely and look smooth. If you are only seeing droplets on the surface, open up the Fluid Knob for more products. HVLP is designed for fine-finishing, and this includes furniture, pianos, cabinets, automobiles, machinery &#; anywhere a &#;Class A&#; coating is to be applied. If you already own airless equipment, you&#;ll find that an HVLP system will complement it perfectly. Although there is some overlap, every family of spray systems on the market has its special place.

6. What is the secret to spraying latex paints?

1) Use the air cap set 1.8mm.
2) Thin the paint upwards of 20% with water.
3) Use additives if necessary.
4) Add the 6ft whip hose to reduce air temperature through the gun.
5) Hold the gun no more than 8&#; (20cm) away.
6) Apply a full, wet coat.

7. Can I spray nitrocellulose lacquer?

It&#;s the same answer as with any coating &#; yes&#; just so long as you thin it appropriately. Spraying of lacquer may be prohibited in your location. Please check with the local jurisdiction. Lacquer fumes are toxic and flammable (combustible), so adequate ventilation is absolutely necessary. Explosion-proof light switches, fixtures, and an extraction fan are a must. Lacquers were formulated to dry extremely fast. The very fact that the turbine motors become hot and produce heated air can be counter-productive with lacquers. If you spray as you would with regular slow-drying paints, you may find that you can only spray a dry coat or you get orange-peel. But as always, there are ways around problems like this.
1) Use the standard size air cap set.
2) Apply at least 2 coats of lacquer sanding sealer first, and sand flat. The sanding sealer sands nicely (unlike some lacquers) giving you a perfect base for the topcoats.
3) Thin the lacquer until it levels out on its own (unless this contravenes local rules).
4) Add a lacquer slowing agent to slow the drying process if dry time becomes a challenge.
5) Add another hose to the standard 25ft hose. This will result in the air passing through the air cap cooler. If you also want more flexibility and lighter weight, choose a whip hose #F
6) Get in close with the gun and apply a wet coat.
If all of the above instructions are followed, then a beautiful finish will result. This assumes that the spray gun is held no more than 8&#; away from the surface being sprayed (closer is ok). We also assume is that the lacquer is thinned enough. In fact, if you have done all of the above and are still getting orange-peel, you will likely have to thin more. Always use lacquer sanding sealer and thinner/solvent from the same company to ensure compatibility

8. Can I use the 3M PPS System Cups with the Fuji?

Yes, if the correct adaptor is used.
The Fuji T70 spray guns use the #18 PPS&#; adapter.
The Fuji T75G spray guns use the #2 PPS&#; adapter.
For the Fuji G-XPC gravity spray gun use the #24 PPS&#; adapter.
Please note that for other Fuji models, you will likely need a different adapter. To find out more information or to purchase these 3M PPS Accessories for your Fuji Spray guns please Click HERE or HERE

9. How do I use the Q5 Platinum Variable Speed Controller Dial&#;?

The Q5 PLATINUM turbine is equipped with a Variable Speed Controller&#; to adjust the speed of the motor. To decrease air pressure, simply turn this dial counter-clockwise. To increase air pressure, turn the dial clockwise.
Click here for full instructions on how to use your Variable Speed Controller Dial&#;.

10. How can I reduce overspray?

Overspray can be reduced to an absolute minimum by doing the following:
a) Adjust the size/shape of the spray fan pattern to suit the object. This may mean moving the gun closer than the maximum 8&#;. Thin objects such as spindles or railings can be sprayed with the round pattern and the gun held up close. Overspray is caused by the particles that &#;miss&#; the object.
b) Thin only as much as necessary and no more. Experiment with less thinning. However, always remember, the paint must be thin enough to level out on its own after being applied wet. Make a note of the thinning for next time.
c) Never hold the gun further than 8&#; away from the surface. Closer is better.
d) Reduce the air pressure at the air control valve. Practice first on scrap material rather than your project. Once the point is reached where the finish starts to suffer, open the air control valve slightly for more air. The complete project can now be sprayed with the same setting for the air. Reducing the pressure is the best way to reduce bounce back and overspray to an absolute minimum. If the finish is not sufficiently thinned, then you will not be able to reduce the air. The paint must level on its own.
e) Learn to engage your trigger on and off accurately. Remember, as you come off an edge and continue to depress the Trigger, hundreds of particles are being sprayed into the air. Eventually, this will build up &#;mist&#; in the room. The Fuji High-Efficiency Aircaps reduce overspray significantly (installed in all our spray guns).
f) Use some type of extraction fan and spray close to it. You may need an explosion-proof fan depending on which product you are spraying &#; please check with the local jurisdiction.

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Brush Specifications

Dimensions

A: Brush Diameter

B: Brush Part Length

C: Overall Length

D:Filament Diameter

E: Head Length

F: Shank Diameter

Brush Material

Stem Material

Filament Material

Galvanized Steel

Steel,Carbon steel,Stainless steel,Nylon,Carbide silicon,Oxygen aluminum

Stainless Steel

Steel,Carbon steel,Stainless steel,Nylon,Carbide silicon,Oxygen aluminum

Aluminum

Steel,Carbon steel,Stainless steel,Nylon,Carbide silicon,Oxygen aluminum

Brass

Steel,Carbon steel,Stainless steel,Nylon,Carbide silicon,Oxygen aluminum

Material

Brush Diameter

Brush length

Overall length

Range

0.047"-3.9"(1.2mm-100mm)

0.12"-19.7"(3mm-500mm)

0.2"-39.4"(5mm-mm)