Q & A

    1. How do I know if your spray gun set-up (nozzle and air cap) will provide the proper fluid delivery rate and spray pattern?

    This chart will help you select the proper HVLP and Conventional nozzle size and is intended for coatings ready to spray under 40 seconds in a #2 Zahn cup. When spraying similar viscosity coatings with a pressure feed system use a nozzle size .015 to .020 less. If you are not sure our standard set-up is for your application, E-mail us with your application with coating viscosity ready to spray.
    1.0mm (.039) Siphon feed detailing or on a pressure feed system.
    1.1mm (.043) Siphon feed detailing or on a pressure feed system.
    1.2mm (.047) Used by Binks primarily in their M1-G gun. use this tip for clear coats when a super-fine finish is desired. Recommended for clears that have a VOC of 3.5 or higher - lower VOC will be too thick for this orifice size. This tip will not "hose" material on, and will take a little longer to paint with due to it's very small orifice.
    1.3mm (.051) A very common tip size used by Sata, DeVilbiss, Sharpe and the import guns. This tip can be used for clears, basecoats, waterbase and single stage paints, but low VOC single stage paint may be too thick for this orifice size. Produces a fine finish. Good atomization.
    1.4mm (.055) A standard size on the Binks M1-G and Sata NR2000. A good "all around" tip. Generally, it can be used for clears, base coat and single stage. Use this tip if you are spraying clear with a VOC of 2.1. This larger orifice works well with thicker clears.
    1.5mm (.059) Used by Sata, Sharpe and the imports. The 1.5 is a versatile tip for base and single stage. Clears have a risk of "orange peel" if not sprayed carefully. This tip will also spray many primer sealers, conversion varnish, waterbase clears and lacquers.
    1.6mm (.063) Used primarily by DeVilbiss, this tip is recommended for "general purpose", light to heavy viscosity materials.
    1.7mm (.067) Widely used for primer, the 1.7 tip will apply thick primer quickly. Popular size for siphon feed guns.
    1.8mm (.070) A little larger that the 1.7, primarily used for primer surfacers. Popular size for siphon feed guns.
    2.2mm (0.87) Extremely large tip. Designed for "high build" primers. May be used to spray fiberglass resin, and coatings greater than 60 seconds in a #2 Zahn cup.

    2. How do I order a gun when I know the set-up I want but it is different than the Finish System standard set-up?

    No problem. Simply E-mail sales@finishsystems.com, call us at 262-784-5977, or Fax your order to 262-784-5975 indicating your preferred set-up with your order.

    3. How can I obtain more information or specifications about your products?

    Our descriptions on the website are sometimes brief. Should you not be familiar with the item, please contact us via E-mail at sales@finishsystems.com requesting more detailed information.

    4. How big does my compressor have to be?

    Typically you will need a minimum of a 5 HP compressor that operates at 50 psi providing 12 cfm to properly supply air to a HVLP spray gun. We know of customers with 5HP compressors that are not able to obtain sufficient cfm to operate their HVLP guns. Since the cfm produced by the pump is compressor specific, you will need to look at your compressor's operating specifications to determine if you do not have enough cfm. Binks, C. A. Technologies, and Asturo offer HVLP guns only needing 6-10 cfm at 25 psi. Some 2 and 3 HP compressors will provide 7 cfm at 25 psi, enabling the use of these brand name guns. Please do not call Finish Systems regarding compressor output, this is something the compressor manufacturer can help you with.

    5. How much should I spend?

    It's been said before and it holds true in this situation as well - you get what you pay for. If you buy an inexpensive foreign-made gun, that's exactly what you'll be getting. Parts will be difficult to find and I'm sure it won't last as long as a quality gun. Our main manufacturers (Binks, C. A. Technologies, Sata, DeVilbiss, & Asturo) each make well-made spray guns in different price ranges. If you are planning to use your gun on a regular basis our suggestion would be to purchase a professional gun. If you are a hobby enthusiast, you can probably get away with scaling down a gun or two. For the rare, or single time user it may be appropriate to shop at the bottom of the price scale. The decision is yours.

    6. Which are better - HVLP (High Volume Low Pressure) or Conventional spray guns?

    With the passage of many new environmental laws, HVLP spray gun manufacturers have pushed forward and emerged with new designs that far surpass that of Conventional spray guns. An HVLP spray gun puts more product on the surface with less "over spray", this results in less material being used and healthier for the world. With that said, many of the new laws require you to use HVLP thereby eliminating the choice. It is your responsibility to find out what the laws and regulations are in your state, county and/or city and purchase the correct spray gun for your intended application.

    7. What information should I provide when requesting a spray gun recommendation from Finish Systems?

    • Preferred spray technology: HVLP, Conventional, Air-assisted Airless, or Airless.
    • Type of coatings being sprayed and their viscosity, which is noted on the coating company's product information.
    • Does the coating company recommend a specific set-up? If so, provide.
    • Your frequency of use.
    • The CFM of your air compressor at 40 psi.

    8. When should I replace my painting respirator?

    Replace chemical cartridges when you detect odor, taste of vapors, or experience eye, nose, or throat irritation. Replace prefilters or filters when you experience increased resistance to breathing.

    9. Troubleshooting spray problems

    Problem: Pulsating or spitting fan pattern.
    Cause: Loose fluid nozzle or needle may be leaking around packing.
    Solution: Tighten parts, clean vent hole on cup.
    Problem: Spray pattern is bent towards the right or left.
    Cause: Aircap horn plugged or dirty on one side.
    Solution: Clean aircap horn hole with wooden toothpick or device supplied in gun cleaning kit. (Note: Never use metal to poke the aircap horn holes!)
    Problem: Spray pattern is heavy in the middle.
    Cause: Under-reduced material, air pressure too low, incorrect fan-control knob setting, nozzle too large.
    Solution: Increase reducer, increase air pressure, adjust fan-control knob setting, change nozzle to a smaller one.
    Problem: Split or hourglass-shaped spray pattern.
    Cause: Over-reduced material, air pressure too high, fan width too wide.
    Solution: Use less reducer, lower air pressure, narrow fan width.
    Problem: Running or sagging material.
    Cause: Applying too much too quickly, gun distance too close to surface, gun travel speed too slow, over-reduced material, air pressure too low, painting on a cold surface.
    Solution: Wait longer between coats; apply medium, not heavy coats; increase gun distance from surface; increase gun travel speed; decrease reducer; increase air pressure; keep job surface at a reasonable temperature.
    Problem: Dry, rough-looking finish.
    Cause: Gun distance too far from surface, air pressure too high, gun travel speed too fast, reducer too fast for temperature conditions.
    Solution: Decrease gun distance, decrease air pressure, decrease gun travel speed, use a slower reducer.
    Problem: Top- or bottom-heavy spray pattern.
    Cause: Dirty aircap horn holes, deformed aircap horn holes due to reaming with a sharp metal object.
    Solution: Clean aircap horn holes with wooden toothpick or device supplied in gun cleaning kit, replace aircap if necessary..

    10. Metric to Decimal Conversion Chart

    11. Is Finish Systems an authorized distributor, dealer or service organization for Graco, , Airlessco, ASM, Titan, Sharpe, or Wagner?

    No, we are not. We are a supplier of some replacement parts for major spray equipment manufacturers. We are an industrial distributor for Accuspray, AOM-Asturo, ITW-Binks, C.A. Technologies, and automotive refinish jobbers of spray equipment for DeVilbiss and Sata.


Finish Systems
2691 S. Calhoun Road, New Berlin, WI 53151
Hours: Monday - Friday 8:00 - 4:30

Order Toll Free 800-657-0703
Phone 262-784-5977 Fax 262-784-5975
E-mail sales@finishsystems.com

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