AIRBRUSH INFORMATION Page 1

How to airbrush tips, with airbrushing information, and parts ofairbrushes for training how to paint

Hello, My name is Dave Keleher, I am the owner of Custom Airbrushing. I have borrowed some of the information listed on this page from off the internet. Most of this info is very helpful and I would like to share it with you as well.
I have however ADDED to it and or listed a few of my own examples, tips, stories to make it more accurate to what my knowledge and experience has taught me. I have color coded my text in this green color and red. All other text in yellow is taken from the original text listed on the internet.

 

Beginning Considerations

Before making a purchase, an artist must first decide why he or she is buying an airbrush, and what applications this new art tool will be needed to perform. These are questions only the artist can answer. For beginning airbrushers, the best choice is to buy an airbrush for one main function, and worry about other functions later (see Airbrush Types below to help select the kind of airbrush needed for different applications).

Be sure to give these questions careful consideration. The time spent researching will be well worth it. Many airbrushes now sitting in closets or on shelves aren't used simply because they were not exactly what the artist needed. The researching process can save the artist many dollars in the long run.

 

Purchasing an Airbrush

Once the artist has decided the primary uses for the new airbrush, the quest for one that meets the artist's requirements begins. There are over a dozen airbrush manufacturers, each with several airbrushes for the most exacting applications. Some manufacturers have in excess of 40 models from which to choose.

As overwhelming as this may be, keeping focused on one's individual criteria narrows the choices. The two trade magazines available to the American market, Airbrush Action® and The Airbrush Magazine®. We suggest getting art catalogs and comparing prices and available models to those of local art stores.

 

Seek Professional Advice

The best source for a beginning airbrusher can be to ask artists who currently do airbrushing professionally. They can offer insight on how to get started and what equipment they prefer. After all, they too were beginners at one time, and know exactly what one goes through making these decisions. Personal acquaintances, art teachers, and local professionals will usually give free advice and may even know of local classes that offer beginning airbrush lessons. Airbrushing magazines have many articles and artist reviews that cite what equipment they prefer. Keep in mind that these professionals have very exacting requirements and typically use several airbrushes to meet all of their spraying needs.
"Please don't e-mail me asking these questions, I will try and get some more info up to help you out ".

AIRBRUSH TYPES

Single-Action vs. Double-Action Airbrushes

"Single-action" and "double-action" refer to the way the air and paint flow of the airbrush is controlled. Single-action means that it sprays much like an aerosol can: just push down the trigger to get it to spray. The amount of paint that comes out is controlled by twisting a knob or screw located near the tip. This type of airbrush is also referred to as an "external-mix," because the air and paint actually mix in front of the needle. There are fewer moving parts that need cleaning, therefore it is an easy airbrush to maintain. The single-action airbrush does not have the precise control offered by a double-action; however, a single action is a great beginner's brush that will always have uses no matter how advanced an artist becomes. Smooth gradations are easily accomplished, and for many artists, this will be the only airbrush they will ever need.

 

A double-action airbrush offers much greater control and is essential when producing fine lines and thick-thin strokes (the classic "dagger stroke"). These are also known as "internal-mix" airbrushes because the air and paint mix inside the nozzle. The double-action airbrush has two trigger movements. As with the single-action, airflow is controlled by pressing the trigger down; however, the amount of paint can also be controlled by pulling the trigger back. The farther the trigger is pulled back, the more paint comes out. T-shirt lettering is much easier with this type of airbrush. Experienced, "freehand" (painting without the aid of masking materials) airbrushers can control a double-action to produce photo-realistic artwork.

Siphon-Feed Vs. Gravity-Feed Airbrushes

These terms refer to how paint is supplied to an airbrush. Although this feature does not directly influence how an airbrush performs, it does indicate the paint capacity allowed before refilling.

Siphon-feed (or bottom feed) means that the color-cup attaches from underneath the body of the airbrush. Air suction pulls the paint from the cup to the nozzle area, where it comes in contact with the air. This type of airbrush is useful when spraying for extended periods of time because the color-cup (typically 1/4 ounce capacity) can be taken off and a bottle can be attached, normally with a capacity of 3 fluid ounces or less.

Gravity-feed essentially means that the color-cup is on top of the airbrush body. Most models have an immovable color-cup. Although larger models can have paint reservoirs of 2 ounces, gravity-fed airbrushes are made for detail, where small amounts of paint are applied at one time. Because the paint is in an open color-cup, some models offer a separate cap to keep paint from drying out in the color-cup. They have a tiny hole in the center of the cap to prevent a vacuum from developing. It is essential that this hole be open to maintain proper paint flow. Siphon-feed bottles also have this hole on the cap for the same purpose.

My Tip : For new beginners... Single action airbrushes suck! if you want to really learn how to airbrush right, then get a double action. I first started out with a single action and I went nowhere for a long time. Spend your money on one airbrush with the most to offer, that's double action. I don't suggest you get a top of the line IWATA airbrush either. Although IWATA is probably the Cadillac of all airbrushes and the best on the market, the part replacement $$ for these airbrushes are insane!!! nozzles alone are around $60 to $75 to replace, needles are around $25.00. ( I own 1 of these brushes).

My Story: "I Think learning to airbrush is like learning to drive a car".
Would you rather take your driving test in an expensive large Cadillac and risk damaging it while learning to drive? or would you rather use a smaller more less expensive substitute car which does the job just fine? Once you have your drivers license for awhile, you can move up to the Caddie anytime!!!

My Advice and #1 Choice for learning: I would suggest getting a Thayer & Chandler "Vega 2000" kit , but they just went out of business (thanks for nothing Badger airbrush). I would still grab one if you could before they are all snapped up, and buy a few needles and tips for it (#3 med ) they go for about $5 dollars each!! You can use these airbrushes for anything. They go for about $75-$120.00 per kit.
(I own two of these brushes)
.

Vega 2000'

 

My other choices would be:

A Badger double action bottom feed brush kit, $80.00-120.00 per kit.

BADGER MODEL 150 ( I own one of these)

BADGER MODEL 175

 

 

Paasche kit . $70.00-$100.00 per kit

Paasche VL MODEL (I have 3 of these)

Paasche (Millennium Airbrush)


DON'T WASTE YOUR MONEY on Aztek Airbrushes (mostly plastic and to dinky for real airbrush artists). (I never owned one).

 

NEEDLES AND NOZZLES

The Airbrush Needle and Nozzle

All airbrushes work on the same principle; air and paint meet at an exact point in space. At that point in space there is a tapered "needle" that projects the combined air and paint forward. This simple concept was used by Neolithic man on the walls of his cave. He would orally grind up the "pigments" (anything from charcoal to berry juice) in his mouth, using saliva as the "binder". His lungs were the air source, his mouth was the nozzle and his tongue was the needle. Fortunately, the airbrush was invented around 1900 A.D., making the modern airbrusher's life much easier.

Obviously, a human tongue is a very blunt, tapered needle that will not allow an artist to spray fine lines. Fine line spraying requires very delicate needles tapered to a delicate point. The finest detail airbrushes have a nozzle size of .18mm. Large commercial spray guns, such as those used for automotive painting, have blunt needles that do not have much of a taper. However, they are made to fit into large nozzles that are meant to deliver much greater amounts of paint.

The nozzle is the part of the airbrush head assembly in which the needle rests. It is tapered exactly the same as the needle it holds. On a single-action airbrush, when the screw is twisted, it widens the space between the needle and nozzle by moving the nozzle. In a double-action airbrush, when the trigger is pulled back, it moves the needle back as well. The farther back the needle moves, the larger the space between the needle and nozzle.

Note: In most airbrush kits (bottom feed, side feed), there are usually three different size nozzles and needles that can be used depending on the work & surface you are painting they are fine,medium, large.
1.) Fine: for very small lines for delicate work, If you are going to do fingernails, hairline cracks or maybe small line flames, detailed images etc. Automotive paints (solvent based paints) work the best with this sized needle and nozzle.

2.) Medium: which is pretty much what you will use most if not all the time for doing EVERYTHING under the sun!!! Most popular applications are t-shirts, mid sized freehand automotive murals, stenciling, helmets, motorcycle tanks, etc.
I used this size of tip/needle for most of the work shown on this website
. This is the best size to used when spraying Createx Paint and most water based acrylic paint.

3.) Large: is used for "large" applications such as sign painting, backgrounds, full color changes on helmets (& small parts), heavier type paints, special effects makeup, and thick protective coverings.

Atomization

What is "Atomization"?
Atomization refers to how finely the particles being sprayed are broken apart. In a garden hose, when there is a light mist of water sprayed, the nozzle is finely atomizing the water. Higher water pressure will allow for finer atomization. In an airbrush, instead of water pressure dictating the atomization, it is accomplished with air. Airbrush nozzle head assemblies have amazing baffling systems that funnel the air around the needle so that the air can atomize the paint evenly. This action gives the airbrush precision.

While there is nothing that one can do to alter the baffling of a given airbrush, the air pressure and paint thickness (or viscosity) can be adjusted to suit a particular need.
In the United States of America, air pressure is measured in pounds per square inch (commonly referred to as P.S.I. ). As mentioned above, pressure influences atomization. In an airbrush equipped with a fine needle, less pressure is required to produce good atomization. This important aspect needs to be addressed before one can decide what the proper paint viscosity should be.

Not enough pressure can result in a stipple paint effect; too much pressure can cause "over spray," which appears as a soft halo of color surrounding the area intended to be sprayed. Other cause and effect issues will be addressed further in this document.

Paint Thickness Differences

The viscosity of the paint to be sprayed is also equally important. Viscosity is measured in Centipoise (cPs). One (1) Centipoise is the resistance of water, hence water has a viscosity of 1 cPs. Golden's ready to spray Airbrush Colors have a viscosity range of 40 - 60 cPs, making them ideal for illustration and fine art. Most textile airbrush colors range from 100 to 400 cPs. A typical house paint is 3000 - 6000 cPs.

If the airbrush is set to an adequate pressure and spattering still occurs, the paint is too thick to be properly atomized. Sometimes raising the P.S.I. can eliminate the spattering, but the correct procedure is to thin the paint. Overthinning can also have adverse effects, therefore switching to a larger needle/nozzle airbrush is also an option the artist must consider.

Matching an Airbrush to the Proper Pressure & Paint System

By understanding all of the above information, an artist can choose the type of airbrush needed for each specific task. For example, when excellent atomization and precision spraying is required (such as with commercial illustration), an airbrush needs to have a fine needle that will work with low air pressure (15 - 40 P.S.I.) and low-viscosity paints. Conversely, t-shirt artists prefer a thicker paint because it will have less overspray and better coverage. They tend to spray at 60 - 100 P.S.I. and require an airbrush that will accommodate the higher pressure and thicker paint. To properly spray housepaint, the spray equipment has a large nozzle and a different baffling system that will allow it to spray at 40 - 60 P.S.I. but atomize like it was at a higher pressure.


Air Sources

What is an "Air Source"?
An airbrush's air source is where the pressurized air (that propels the paint) comes from. Aerosol cans, CO 2 tanks, air regulators, air compressors, air tanks, even tire innertubes can be considered to be air sources. Don't use the last two ideas.

Often, an air source can be a bigger investment than all of the needed airbrush equipment. If an artist is just exploring the possibilities of an airbrush with the least amount of investment, renting the air source may be a better initial investment.

Dave Says: "Use a credit card" and buy a compressor paying an installment every month using your "customers" project money to pay it off, rather then throw your money away on renting something you can't keep!

OR

Buy a good used /second hand one ...flea markets are full of small compressors and nubilizers.

"COMPRESSORS DO NOT HAVE TO BE EXPENSIVE!"

 

Selecting the Proper Air Source
The type of needed air source is dictated by three factors:

  • The type of spray equipment being used.
  • The type of airbrushing being done.
  • The volume of airbrushing.

The type of spray equipment one is using: has a great impact on what air source to obtain. If an artist's airbrushing consists of an occasional decorative spraying of food coloring onto a birthday cake, then the aerosol cans of compressed air found in many art stores would suffice. If an artist plans on airbrushing t-shirts in the local mall, he or she will require a source that can deliver a constant 100 P.S.I. all day long, and probably a very quiet one to prevent the personnel at the next door clothes store from issuing a formal complaint.

Below is a Quick Reference Chart showing the pro's and Con's of the more popular air sources

Air Source Type

Positive Attributes

Negative Attributes

Compressed Aerosol Can

constant air pressure, silent, very portable

expensive, low pressure, runs out fast!

Tire Inner Tube

low cost, refillable, constant air pressure, silent, portable

low pressure, runs out fast, pressure quickly lowers with lots of dirty air.

Air Tank

low cost, refillable, very portable, various sizes, pressure regulator

medium pressure, runs out fast, pressure quickly lowers.

Air Regulator/Compressor (without Air Holding Tank)

inexpensive, long life, small size

constantly runs, gets hot, low pressure, pressure drops of while spraying, noisy, uses electricity, pulsating air flow.

Oil Lube Air Compressor

moderate pricing, reservoir tank, higher pressures, automatic shut-off, built in regulator, constant air

noisy, needs frequent oiling, oil can get into airline, uses electricity, tank needs frequent "bleeding" of moisture.

Oil - less Air Compressor

moderate pricing, reservoir tank, higher pressures, automatic shut-off, constant air, built in regulator

noisy, uses electricity, tank needs frequent "bleeding" of moisture.

Silent "Pancake" Compressor

"silent", automatic shut-off, constant air, built in regulator, compact size

expensive, uses electricity, needs frequent "bleeding" of moisture and has only so many operating hours before it burns out.

CO 2 Tank

truly silent, built in regulator, moderate pricing and/or rentable, no electricity needed, portable, long lasting, moisture-less air source

needs refilling, all connections must be secure to avoid freezing up, moderate danger of compressed inert gas, and don't forget dying of suffication from too much CO2 .

 

The Cheap & Easy Way Out

Most beginning airbrush artists are not sure how much they are willing to invest because they don't even know if they are going to like it. This is certainly a valid point to consider, but buying equipment simply because it is cheaper may hurt the artist initially by making airbrushing that much more difficult to do. The idea is to buy an airbrush that is inexpensive but not cheaply made. The air source may already be in the garage, or at the neighbor's. If the application does not require a lot of pressure, the aerosol cans may be the way to go (very costly). A local welding supply house (or local welder) may be able to rent a CO2 tank for a weekend or two (Very Dangerous if used in small unventalated areas). Equipment rental places should have compressors to rent as well (make sure airfilter is good on it). Although they will have them set up for building contractors, an artist can use them as well (change the pressure to what you need).

For beginners, The point is one does not have to invest hundreds of dollars in order to try airbrushing. If there is a good local art store, ask them to demonstrate the models of airbrushes they have. Be wary of the cheap $99 compressors that seem like a good deal in the store, but couldn't spray water evenly (these would be the cheapy silent diaphragm ones). Most art applications of airbrushes require steady air pressure, which means that the air should be stored in a tank first. If a model does not have an air tank, the artist will most likely be fighting to maintain adequate pressure. Airbrushing is hard enough to get a handle on without having an air source complicate the matter further. Try and get a compressor bigger then 1/6 hp.

MyTip: If you can handle the noise of a oilless non-silent compressor, run a hose from one room (where the compressor is located) to another room where you are/will be airbrushing (no more than 50 feet of hose), I find you can buy a non-silent oilless compressor for about $100.00 that work just fine.

[ My Story: I used an oilless, piston driven "tankless" Sears 1/4 hp compressor everyday painting for about 14 years straight (sometimes running it for 24 hours non-stop)!!!
I bought it for $100.00 from a clearance centre and made my money back on the first project I painted. I gave the compressor away to a airbrush friend of mine in 2005....he is still using it today!!! true story. ]

MyTip: I used a large moisture trap between the 1/4 hp compressor and airbrush that acted as a temp small tank to smoothen out the sputtering of the piston and it kept the pressure up in the hose..

   
     

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