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Frequently Asked Questions - Sprayer

The Preval Sprayer is professional, affordable, precise, compact and easy to use no matter what type of job you are tackling. Sprayers can be used multiple times with multiple paints. Paint-filling stations are much more expensive and carry a greater liability than most people realize. Further, giving your customers the ability to add their paint to a Preval Sprayer will enable you to guarantee optimal results with unadulterated paint, as opposed to independently operated filling systems that combine paints with propellants. Learn more about Preval.

Almost all liquids and paints, including latex, laquer, water-borne, solvent-based and clear coats. The Sprayer is also ideal for atomizing primers, dyes, 2-component chemicals, tanning solutions and stains. You can use a Preval Sprayer in place of a professional spray system on automobiles, boats, helicopters, or pretty much anything you can imagine!

Whether you need to touch-up machinery, cabinets, or crown moulding, the Sprayer will achieve a precise spray job like no other portable sprayer in its class. Professionals will mix multiple chemicals and spray 2- and 3-component epoxy, varnish and shellacs.

You can also use Preval for DIY projects, like stenciling or painting and making your own colored paints with wine or kool-aid on projects with your kids.

The Sprayer can even be used as a cleaning device.Simply add baking soda and water, and you'll have a great eco-friendly household cleaner!

Yes! The Preval Sprayer is superior to a standard aerosol paint can for many reasons.

First, you can fill the Sprayer with the exact amount of paint you wish to use, minimizing waste. Second, you can add in hardeners, accelerators, catalysts to inexpensively create 2-component spray paints . Finally, standard aerosol cans allow paint to sit for long periods of time, becoming adulterated by mixing with the solvents and propellents. In the Preval Sprayer, paint and the propellant never mix in their liquid state.

The Sprayer holds less than 2oz. of propellant and sprays up to 16oz of paint or liquid OR 18 minutes continuously. For paint coverage see second page of Owners Manual -

There is no comparison, when you factor in the Sprayer's versatility. The cost of a Preval Sprayer is about the same cost as most aerosol paint cans--less than $10. But with the Sprayer, any paint can be aerosolized. One Sprayer can be used multiple times to spray numerous different paints. In addition, the Sprayer can accommodate 18 oz. of paint compared to aerosol paint cans, which normally contain 4 oz. of solvent, 4 oz. of propellant and 4 oz. of paint.

If you are a marketer, distributor or retailer and would like to speak with us about re-selling any Preval product, please email us or call 815-634-5890.

Preval products are sold at a most major retailers as well as many smaller outlets. They are usually available through retailers' web sites as well. In stores, they are generally displayed in the paint spray section at major retailers, near other name-brand products such as Rustoleum.

Yes. Both the aluminum aerosol power unit and the glass jar can be recycled. Deplete the power unit and then dispose of it.

To clean your Preval Sprayer, simply spray paint thinner alone for 10 seconds. Paint thinner is the product used to condition the paint to allow for better spray flow. Thinners include water, acetone, mineral spirits and/or lacquer thinner. Whatever thinner you are using for your solution, you can also use for cleaning. Use the proper cleaning agent as specified by the manufacturer for the paint liquid you are using.

If you do not properly clean your Preval Sprayer you wll have trouble using it in the future as any contamination will reduce the Preval Sprayer's output or even clog it completely. If the Sprayer is clogged, put your finger on the red insert inside of the button nozzle and cover it.  While covering, press down on the button to force air to flow in reverse. The should clear clogs.If that doesn't work. remove the product contaner by twisting it off the Sprayer, hold the Sprayer upside down and try to spray propellant.

Cleanliness is even more important on the inside of the button. If this occurs, please take off the button and soak it in thinner and use a Q-tip to clean around the insides.  

Please send an email to and type "UNSUBSCRIBE" in the subject heading.

We guarantee our product.  If a customer would like to return products purchased from, the buyer must send an email ( to make a return request. It is the responsibility of the buyer to pay for the return shipping, which can be done at any UPS or FedEX location. Preval does not recommend that our customers return Preval products via USPS. Preval will e-mail a return authorization, please print and include with returned product. will issue an on-line credit for the return purchase, which can only be used for a future purchase on and not with any of our re-sellers. A 25% re-stocking fee will be charged to the credit card originally used on the order. does not accept return purchases made from one of our re-sellers.

For orders placed through, the following cancellation policy applies:

Buyer's must call 877-753-0021 or email within 24 hours to reach one of our customer service representatives. The order must be canceled prior to shipping. For orders that have already shipped, buyers can return the product(s) and a credit will be issued, minus a 25 percent re-stocking fee.

Please refer to our return policy for further information.

Preval's shipping policy is dependent on whether you are a domestic buyer or an international buyer. For domestic buyers, we ship LTL, UPS priority or UPS ground. Shipping charges will be applied to the order when a buyer makes a purchase on, unless the buyer is qualified for pre-paid shipping. International buyers are responsible via FOB our plant. If a return is requested, then it is up to the buyer to coordinate shipping with his or her preferred shipping company. Please refer to our return policy for further information.

Absolutely. To protect our customers' private information, uses a SSL (secure socket layer), which means that any information you enter for your order on will be encrypted during the transmission of your order. When confirming your order, we only reveal the last four digits of your credit card number. We do, however, transmit the entire credit card number you enter to the appropriate credit card company during order processing.

You can download the owner's manual here.

•    DO NOT work in direct sunlight.

•    Remove rails, cleats, louvers, snaps, striping tape, etc. Remove seals from the edges of parts or fittings when doing a repair around that part or fitting. Clean repair area and all tools with acetone prior to application. Spray acetone to clean out Sprayer and/or vFan Airbrush.

•    Duct tape off adjacent gunwale molding, and deck fittings you are unable to remove. Duct tape is recommended over masking tape because it provides better protection.

•    Gel coat should be applied in temperatures of 60ºF to 80ºF.

•    Always use eye and hand protection. Read all warnings on product labels.

•    FOR SAND-DAMAGED AREAS, the heavier fast-cut grits (40/80/100) are used to feather sand and ground out a routed area prior to filling. Also, they are used for the first sanding of gouges, dock dings, scratches, and blisters. When sanding areas that have been filled with putty we suggest using 40 or 80 grit sandpaper, depending on how large the repair is.

•    Once the fill area is level or contoured to the desired shape, sand with 100 grit paper to remove the course scratches from 40 or 80 grit. You should also feather the surrounding area of the gelcoat repair with 220/330.

•    When sanding flat areas use a rubber block. We recommend 3M abrasives for best results.

•    CATALYZE FRESH BATCH OF GELCOAT properly. Measure catalyst accurately. Under- or over-catalyzed gel coat will cure slower and look faded or chalky.

•    Do not add more than 15-20% by volume of Styrene Monomer.

•    Pot life (amount of time for application of the product) shortens dramatically as you mix larger batch sizes. Keep in mind that you have a limited time to apply what you have mixed (usually between 5-15 minutes).

•    Gelcoat will not fully cure without adding a surfacing agent or over spraying with PVA.

•    When spraying gelcoat, check color thoroughly before applying. Gelcoat will not darken or change colors when it dries. 

•    Generally, mix 5 oz. batches. A good practice is to pour the mixed gelcoat from the mixing container into Peval product container used for application. This further assures that no uncatalyzed material is clinging to the sides of the pot. “Lay on” the gel coat in a heavy thickness (about 10 mils) using horizontal strokes, and working from top to bottom. Avoid brushing as this could remove the waxy surface additive. Remember to always lap wet.

•    Generally, one heavy coat is sufficient. However, if you have opacity problems two coats may be necessary with a light sanding between coats. Once the coating (gelcoat) has cured, it should be block sanded using a 250 wet grit paper to remove all brush marks and high spots. Following this, it should be wet sanded with 320,400 and 600 wet grit paper, buffed, polished and waxed.

•    If there is a trim color, you need to switch the fan aircap from the vFan Portable Airbrush System and replace it with a standard aircap. Gelcoat requires the addition of fiberglass resin hardener or catalyst (MEKP) at 2% by volume (77ºF). Measure catalyst accurately. Measure catalyst properly as using too much or too little may effect curing and cause fading and chalking. Gelcoat will not fully cure without adding a surfacing agent or wax additive sanding aid. You can spray with PVA before gel coal reaches its gel stage (5-10 min.), or adding 1oz per quart of wax additive sanding aid.

•    Gelcoat may be thinned for use in a Portable Preval Sprayer with styrene monomer. The Sprayer is an amazing spray system however acetone is NOT recommended except in clean-up. Do not use more than 15% by volume of thinner, and always add thinner, tint, OPR metal flake first then add the Catalyst or Hardener and mix thoroughly. Over thinning will result in an inadequate thickness for full curing.  

•    For more detail and precision we recommend using vFan Portable Airbrush System which works with your compressor and is designed for portability, precision paint atomization and material dispensing; for professional touch-ups and surface repairs; surface preparation; and fast curing. The vFan Airbrush delivers a 3” fan and a 1/16” hairline spray pattern.  The dual action vFan is easy to control allowing the user to manage air volume and product output. This precision-based technology allows vFan Airbrush users to atomize product finish coatings, paints and chemicals with nano-sized droplets for ultra-thin layering to feather, blend and to speed up cure times. Initially spray a cover coat as smooth and evenly as you can to cover your repair. This coat should be mostly in the repair area, and may be repeated. Sanding between coats is not necessary unless a surfacing agent has been added to your gel coat. Once your repair is covered, feather a ‘flow’ or sanding coat on the masked-off area making layered passes to avoid a buildup of gel coat in any one area.

•    Each of these coats of gelcoat may involve several passes. Be even and consistent in your Sprayer or vFan movement, overlapping each previous pass slightly and not hesitating on the ends. When spraying to a radius, flow the gelcoat to the tape. In open flat areas, layer passes. Final thickness should be 12-15 mils minimum or the gelcoat may not fully cure. As soon as you are done spraying, clean your sprayer fully with acetone. Most re-sprayed gel coat will cure in 2-4 hours, although overnight cures are ideal. Begin wet sanding with the finest grit that will remove orange peel in the re-sprayed area. This will avoid unnecessary sanding scratches. Usually 320 or 400 grit wet paper is sufficient for the initial sanding. Wet sand to a 600 finish and buff with 3M Finesse-It Marine Compound and polish with Scotchgard Marine Liquid Wax.

•    Store gel coat in a cool, dry place.

Preval's iconic Sprayer and vFan Portable Airbrush System fill a void in all of the coatings industries, and satisfy multiple needs among industrial, contractor and consumer users. By simply connecting an aerosol can to our delivery system, any coating user can professionally deliver unadulterated, fine finishes, touch-ups and coatings for small surfaces.

Preval supports its distrubutors in many ways to ensure a mutually beneficial relationship. From marketing to logistics, Preval is the ultimate partner in growing your business.

Yes. To learn more, click here.

The Preval Sprayer's International UN Number is: 1950 Proper Shipping Name:AEROSOLS

  • Hazmat Class:2.1
  • Packaging Group:No packing group (LTD QTY)
  • Weight per selling unit: 0267 (5 lbs) 0268 (3 lbs)

The Preval Sprayer is exempt from Department of Transportation hazmat/hazardous good regulations. 


Absolutely. (For thicker paints, remove the strainer at the bottom of the dip tube.) 
Follow these steps:
  1. Thin as necessary.
  2. Stir 
  3. Attach
  4. Test spray at 45 degree angle
If any clogs occur:
  1. Put a warm rag over the red orifice in button, and depress button to push back any clogs.
For a more powerful spray:
  1. Wrap power unit with the warm rag while spraying.


The Sprayer can accommodate latex paints, but the dip tube must be primed in order to do so. Remove the strainer from the dip tube, hold a rag (or use your finger) over the red insert in the button, block the orifice and push the button down for a second (you will see bubbles in the liquid as the clog of latex is pushed out of the unit). 

If the power unit gets cold, wrap it with a hot towel to bring it to room temperature or the pressure will become too low.


The vented cap is designed to allow small amounts of air into the product jar. When the Sprayer and vFan pull paint up the dip tube, and the pressure inside the jar reaches a certain point, air flow through the product jar relieves some of the pressure. 


  1. Strain paint using a fine paint strainer or a nylon stocking. (if you don't strain the paint the diptube will clog.)
  2. Thin paint accordingly.
  3. Remove the plug from the bottom of the dip tube.
  4. Test spray.

Yes.  The Preval Sprayer is ideal for spraying PVA over larger surfaces.

 The key is testing it first by thinning it with water and based on those results you'll know of less or more water is needed.

Afterwards, make sure you clean the Sprayer with warm soapy water.

If you have small or very detailed surfaces that need PVA spraying you should use our vFan System.