Frontpage Slideshow | Copyright © 2006-2015 JoomlaWorks Ltd.

Basic Air - Brushing Techniques

BASIC AIR - BRUSH TECHNIQUES© 2005 H&R TRAINS INC.

 

WHAT IS AN AIR - BRUSH ?THERE ARE SEVERAL DIFFERENT TYPES OF AIR - BRUSHES: DUAL - ACTION INTERNAL MIX; SINGLE - ACTION INTERNAL MIX; AND SINGLE - ACTION EXTERNAL MIX, ETC.

 

"DUAL ACTION" REFERS TO THE WAY IN WHICH AN AIRBRUSH IS TRIGGERED (PRESS DOWN FOR AIR, AND BACK TO ADJUST THE AMOUNT OF PAINT) THIS ALLOWS YOU TO CHANGE THE AMOUNT OF PAINT THAT COMES OUT THE TIP WITHOUT STOOPING TO ADJUST THE BRUSH EACH TIME.

WHEN A "SINGLE ACTION" BRUSH IS TRIGGERED A PRE - SET AMOUNT OF PAINT IS SPRAYED. THE AMOUNT OF PAINT CAN BE ADJUSTED BY TURNING THE ADJUSTMENT SCREW WHILE HOLDING DOWN THE TRIGGER.

"INTERNAL MIX" AND "EXTERNAL MIX" IS THE METHOD BY WHICH THE PAINT AND THE AIR COME TOGETHER. THE "INTERNAL MIX BRUSH PRODUCES A MUCH SMALLER DOT PATTERN THAN THE "EXTERNAL MIX" AIR - BRUSH.

THE EXTERNAL MIX AIR - BRUSH USUALLY WILL MEET THE NEEDS OF MOST MODEL RAILROADERS. THEY ARE USUALLY EASIER TO CLEAN AFTER EACH USE AND THEY ARE LESS COSTLY LESS COSTLY AS WELL.

WHY AIR - BRUSH ?

AN AIR - BRUSH ALLOWS A MUCH MORE NATURAL LOOKING, SMOOTH FINISH THAN YOU COULD GET WITH A CONVENTIONAL PAINT BRUSH.

WHEN SHOULD YOU USE AN AIRBRUSH ?

AN AIR - BRUSH CAN BE USED IN SO MANY WAYS THAT IT WOULD BE HARD TO SAY JUST EXACTLY WHEN TO USE ONE. IT CAN BE USED TO PAINT YOUR SCENERY BACK DROP, LOCOMOTIVES AND ROLLING STOCK, OR IT COULD BE USED TO PAINT STRUCTURES.

IF YOU ARE AIR - BRUSHING A STRUCTURE, IT CAN USUALLY BE DONE WHILE YOU ARE DOING THE BUILDING ASSEMBLY. IT WOULD BE BEST TO PAINT THINGS SUCH AS WINDOW FRAMES OR OTHER SMALL PARTS BEFORE YOU GLUE THEM IN PLACE.

HOW TO AIR - BRUSH ?YOU WILL NEED TO HAVE AN AIR SOURCE FOR YOUR AIR - BRUSH BEFORE YOU BEGIN. AN AIR COMPRESSOR IS USUALLY BEST. THERE ALSO NEEDS TO BE A FILTER AND MOISTURE TRAP BETWEEN YOUR COMPRESSOR AND YOUR AIR - BRUSH. THIS IS ESPECIALLY IMPORTANT IF YOU WANT A FINE SMOOTH FINISH. ALTERNATIVE AIR SOURCES SUCH AS A SPARE TIRE WITH THE PROPER ADAPTER, OR A CAN OF COMPRESSED AIR WILL WORK FOR SMALL JOBS.

IF YOU USE A COMPRESSOR, YOU WILL NEED A 1/4 INCH PIPE ADAPTER. WHEN YOU ARE USING A NON TANK MOUNTED DIAPHRAGM TYPE AIR COMPRESSOR YOU WILL NEED TO DRILL A SMALL BLEEDER HOLE IN THE ADAPTER WITH A 1/32 OR # 72 INCH DRILL BIT THROUGH THE FLAT SURFACE, JUST PAST THE TAPER ON THE ADAPTER.

MOST PAINTS ARE TOO THICK TO SPRAY WITH OUT THINNING. YOU SHOULD ALWAYS FOLLOW THE MANUFACTURERS RECOMMENDATIONS, HOWEVER MOST PAINTS WILL NEED TO BE MIXED ONE PART PAINT TO ONE PART THINNER.

IF YOU ARE USING A LACQUER OR ENAMEL BASED PAINTS BE SURE TO USE THE THINNER FROM THE SAME MANUFACTURER FOR THAT PURPOSE. YOU CAN USE ANY LACQUER THINNER FOR CLEAN UP, BUT USING ANYTHING BUT THE CORRECT THINNER COULD AFFECT THE QUALITY OF THE PAINT.

YOU NEED GOOD VENTILATION WHEN SPRAYING MOST ALL PAINTS, BUT BE PARTICULARLY CAREFUL WITH LACQUER OR ENAMEL BASED PAINTS. THEY ARE ALSO QUITE FLAMMABLE SO THE PROPER PRECAUTIONS NEED TO BE TAKEN TO SAFEGUARD AGAINST FIRE OR EXPLOSION HAZARDS AS WELL.

THE SIZE NOZZLE AND THE PRESSURE YOU USE WILL DEPEND ON THE TYPE OF PAINT YOU ARE USING. A MEDIUM NOZZLE WILL WORK WELL FOR MOST MODELING APPLICATIONS. GENERALLY YOU WILL NEED A MEDIUM OR COURSE NOZZLE FOR THE THICKER PAINTS SUCH AS WATER BASE PAINT OR ACRYLICS. THE PRESSURE WILL VARY AS WELL WITH A HIGHER PRESSURE BEING USED FOR THE THICKER WATER BASE PAINTS, AND A LOWER PRESSURE FOR THE THINNER LACQUER BASE PAINTS.

A PRESSURE RANGE OF 10 - 15 LBS. WORKS PRETTY WELL FOR LACQUER OR ENAMEL, AND BETWEEN 15 - 30 LBS. FOR WATER BASED PAINTS. YOU WILL HAVE TO EXPERIMENT WITH EACH PAINT TO FIND THE RIGHT PRESSURE.

KEEP AN EXTRA JAR OF THINNER HANDY TO RUN THROUGH THEAIR - BRUSH TO CLEAN THE NOZZLE BETWEEN DIFFERENT COLORS, OR WHEN PUTTING THE AIR - BRUSH DOWN FOR A WHILE.

FILL THE PAINT JAR 2/3 FULL OR LESS AND ATTACH TO THE AIR BRUSH. USE A NEWSPAPER OR OTHER SURFACE TO TEST THE AIRBRUSH BEFORE YOU ATTEMPT TO PAINT YOUR MODEL.

MASK AREAS THAT YOU DO NOT WANT TO BE PAINTED BEFORE YOU START WITH PHOTO FRISKET OR MASKING TAPE. A PIECE OF ACETATE OR CARDBOARD CAN ALSO BE USED AS A MASK ON FLAT SURFACES. FOR SHARP LINES HOLD THE MASK AGAINST THE SURFACE, AND FOR SOFT EDGES HOLD THE MASK AWAY FROM THE SURFACE SLIGHTLY WITH A RULER OR OTHER MATERIAL.

HOLD THE AIR -BRUSH ABOUT SIX INCHES FROM YOUR WORK AND MOVE IT BACK AND FORTH PARALLEL TO THE SURFACE AS YOU PAINT. START MOVING THE AIRBRUSH BEFORE YOU PRESS THE TRIGGER AND FOLLOW THROUGH AFTER YOU RELEASE THE TRIGGER.

OVERLAP EACH PASS SLIGHTLY, BUT BE CAREFUL NOT TO GET TOO MUCH PAINT ON AT ONCE. IT WOULD BE BETTER TO APPLY SEVERAL COATS TO GET THE COVERAGE YOU WANT, ALLOWING THE PAINT TO DRY BETWEEN EACH COAT.

TOOLS AND OTHER EQUIPMENT

1) AN AIR - BRUSH

2) AN AIR SOURCE - (A COMPRESSOR IS PREFERRED)

2) PAINTS AND IN VARIOUS COLORS FOR AIR - BRUSHING

3) AN APPROPRIATE THINNER FOR THE PAINT BEING USED.

4) MASKING MATERIAL SUCH AS PHOTO FRISKET, MASKING TAPE, ACETATE, AND CARD STOCK.

5) SCISSORS, RULER, AND A HOBBY KNIFE.

6) COTTON SWABS, PIPE CLEANERS, A STIFF TOOTH BRUSH, AND A RAG FOR CLEANING THE AIR - BRUSH WHEN YOU ARE FINISHED.

NOTE: YOU CAN USE PLAIN LACQUER THINNER FOR CLEANING THE AIR - BRUSH. THIS WILL BE CONSIDERABLY MORE ECONOMICAL THAN THE THINNER.

 

Home