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ASM Block 8

Painting and paint removal

QuestionAnswer
Cleaning operations during paint surface prep will be IAW what TO ? 1-1-8
Which TO authorizes chemical removal of paint coatings on an advanced composite? Chemical removal of of paint from composites is not authorized
What preferred grits of sandpaper are used for topcoat removal and primer removal? Topcoat 120, primer 240
What abrasive is preferred when attached to a random orbital sander? Sandpaper, hook and loop, abrasive mat
What are the steps when operating the DA sander? Tool must be triggered prior to touching the metal surface and stopped once the tools off the surface
What safety procedure must be adhered to when choosing abrasives for pneumatic drills? Abrasive must have higher RPM than tool
What is the recommended method of coating removal from advanced composites? Plastic media blasting
What grade of aluminum oxide/nylon abrasive mat would you use to remove topcoat mechanically from an advanced composite? medium
What is the preferred method to remove powder/dust from paint removed surfaces? HEPA Vacuum Cleaning
What are six recommended PPE items to be worn when removing coating systems. Air purifying respirator with HEPA cartridges Disposable nitrile gloves Ear plugs Safety goggles Tyvek or cotton coveralls Safety toe boots
What TO outlines procedures for using PMB? 1-1-8 in general. 1-1-690 for composites
What are the three major components of the PMB cabinet/booth? Dust collector blasts/reclaimer assembly metal cabinet
How far should the nozzle be held from the surface when using Type I media in the booth? 12 to 24 inches
What nozzle pressure is used when blasting with Type V media in the cabinet? 25 to 40 PSI
Cleaning operations should be IAW what TO? 1-1-691
Once the aircraft is centered in the blasting booth, what should be done next? Aircraft must be properly grounded
The dust created from blasting will be treated as? Hazardous waste
How often should the filters on the blasting cabinet be shook? 4 hrs
What mixes blast media with compressed air? Adjustable metering valve
What PPE is required when operating the PMB cabinet? Safety glasses hearing protection dust/particular type respirator mask steel toed shoes coveralls
What PPE is required when operating the PMB booth? Tyvek or cotton coveralls; leather shoulder cover Leather and disposable nitrile gloves steel toe boots earplugs blasting helmet with supplied air
How do you determine if the surface of a metal is clean? Water break test
What happens if oil is present while performing a water break test on metal? Water gathers into discrete separate droplets with in 25 seconds
How long should the alodine dwell on the surface when you chemically passivate aluminum? 1-5 minutes
If the surface turns green when applying the alodine, what should you do next? Clean surface again
What is the recommended PE for applying alodine? Air purifying respirator with HEPA filter Butyl rubber gloves earplugs safety goggles or face shield rain suit and safety Toe boots
How do you control the amount of fluid sprayed? fluid needle adjustment screw
How much fluid does the standard fluid cup hold? one quart
What are the parts of the nozzle assembly? air cap and fluid tip
What low pressure air PSI is used to atomize the coating material at the spray head? between 1 & 10
When adjusting the gun to obtain the proper spray pattern, What must you do to adjust the flow of at the gun to obtain desired spraying characteristics? Air and fluid
Why should barrels of hazardous waste be opened slowly? to release pressure
What safety equipment should be worn when conducting cleaning operations? face shield/ goggles, respirator, rubber gloves, acid-resistant apron
What are two methods of cleaning spray guns? manual cleaning and spray gun cleaning unit
Why must you operate the gun-cleaning unit with screen and canister filters? failure to do so will result in clogged nozzles and reduced pump efficiency
What seven defects can occur from inadequate surface treatment? Pinhole cavities peeling, blistering, fisheyes, pitting or cupping, crazing, mud cracking, checking, and sandpaper finish
Pin holes are also known as? Solvent pop
What type of painting defect is caused when silicone products are left on the surface? Fish eyes
What TO would you use to look up an authorized cleaner? Table 3-2 in 1-1-8
What are the six proper spray techniques? Do not arc or wave the gun, stay 90° to the surface, maintain 6 to 10 inches from the surface, use proper triggering, maintain the same speed with your strokes, always overlap 50%
What temps should the coating be before applying it? Room temperature
What TO do you check for mixing instructions? 1-1-8/manufacturers instructions
What causes paint to streak? Not overlapping and not maintaining 90° to the surface
How often should you clean the spray gun? Every time you paint
A buildup of paint in the center of the spray pattern is what defect? Heavy center
What spray pattern defect occurs when the atomizing pressuring is too big high? Split spray
If the pattern is heavy right or left, check to see if a wing port is clogged by turning the air cap to how many degrees? 180
What conditions may cause application method to be unworkable? Unusual climatic or atmospheric conditions
What defect takes on a prune skin effect? Wrinkling
Blushing is commonly referred to as? Clouding or whitening
What is the first item you check if paint will not come from the spray gun? Are you out of paint
If the needle and the fluid tip are not the exact same size, what problem will you have? Paint leaking from the gun
Excessive fogging is caused by two factors. What are they? Gun pressure may be too high or the coating may be thinned much
After ensuring all parts are tightened on the outside of the spray gun, you removed the air cap and tighten the what to stop gun from sputtering? Fluid tip
What are used for volume painting? Pressure fed tanks/pots
The pressure pot tanks vary in size, from how many gallons? 2 quarts to 120 gallons
What must be increased or deceased to change the rate of flow, or the amount of material sprayed? Air pressure
Name the two ways to power a paint agitator. Pneumatic or electrically
Define spray booth. Fireproof compartment room or enclosure built to confine and exhaust fumes and overspray from the painter and the coding system
If the speed of air in the spray booth is too low, what must be increased? Air velocity
What removes overspray from the spray booth area by pulling air through baffles/filters? Exhaust fan
What does an air replacement unit do? Automatically provides make up air (filtered and heated) to eliminate the problems of air deficiency and airborne contaminants
Define manometer A draft gauge that indicates when paint arrester filters or intake filters are filled to capacity, restricting airflow
A well maintained spray booth will provide positive results on a continuous basis with simple day-to-day ? and ? Cleaning and maintenance
What is the minimum safety PPE requirement when changin used filters in a spray booth? Eye and hand protection
The three primary goals of the Air Force's general policy on aircraft paint are? Appearance, corrosion protection and prevention, and serviceability
How should cleaning the surface be accomplished to prevent smearing or transferring contaminants back to the surface? Wipe from center out, turning cloth continuously
What should you use to scuff sand a painted surface? Medium grade or 120 grit silicon carbide sandpaper
Define "tack rag" acft wipe dampened with solvent
TO 1-1-8 requires between how many hours to topcoat after priming? 5-8 hours
If primer has sat on the surface for more than 8 hours but less than 24, how is it reactivated? With an approved solvent by wiping surface
What do you use to scuff sand primer if it has sat for over 24 hours? 320-400 grit sandpaper, grade B abrasive mat, hook and loop or roloc discs
After selecting topcoat, how long do you agitate the resin on the mechanical paint shaker? 3-5 mins
How long should primer "dwell" before a viscosity check? 30 mins
Name two viscometers used to check viscosity IAW TO 1-1-8. zahn cup and ford cup
How many seconds is the viscosity in a #2 Zahn cup when measuring aircraft topcoat? 17-23 seconds
Define tack free time. time that the surface film will not finger print, or can be moved
Prior to topcoating, what should you do one more time to remove any dust or debris off the surface? tack rag
At 75°F, when can a part be handled, taped, or masked? 6 hours
At 75°F, how long should the paint cure before a wet tape test is performed? 48 hours
Before aircraft's first flight after full paint, the coating system should cure at 75° F for how many hours? 72 hours
For safety guidance, what publication is used for respiratory protection? AFI 48-137
What PPE is required for coating application? Air purifying with OV / N95 cartridges, disposable nitrile gloves, ear pro, safety goggles, tyvek /cotton coveralls, safety toed boots
TO 1-1-8 outlines your local__________? Bioenvironmental engineers more/less restrictive controls
When removing paint from composites how far should you remove the paint when using a dry abrasive? only down to primer
What are the booth parameters for Type V Acrylic plastic media? Nozzle pressure 25-40, stand-off 12-24", and impingement angle 30-90°
What are the cabinet parameters for Type V Acrylic plastic media? Nozzle pressure 25-40, stand-off 3-5", and impingement angle 30-90°
What are the major components of a blasting cabinet? cabinet or glove box, blast/reclaimer assembly, Dust collector
What are the major components of a blasting booth? Blasting unit (booth), blast/reclaimer assembly, Dust collector
On the Theory of Operation of blasting, what should be in place prior to blasting? clean dry compressed air mixed with clean dry media
What TO should you use to clean prior to blasting? TO 1-1-691
What does cleaning the surface before blasting help prevent? prevents the media from clumping and becoming contaminated and possible damage to the blasting unit.
What important step is required before blasting on equipment? Control leaks
What should you do to prevent a surface from direct impingement (blasting)? Mask the area not wanted to be blasted
What areas are required to be masked prior to blasting? ID plates, Crevices, Gaps/Seams
Once an aircraft or part has been positioned for blasting in the booth, what is the next step? ground the aircraft or part
When maintaining the dust collector in the cabinet, how often should you clean the filter? Shake filters every 4 hours of use
When maintaining the dust collector in the booth, how full should the barrel be? no more than 90%
What type of things need to be checked prior to and after blasting? Hoses and valves, vibrating screen, dust collector, media level, Breathing air (booth only), drain moisture separator, magnetic separator. respirator/helmet adjustments
What type of adjustments will need to be made before blasting? air pressure according to media type, metering valve, nozzle pressure, respirator/ helmet
At what point will the blasting blasting system be shut off because of breathing air? When breathing air is 20 parts per million
When cleaning up after blasting what is the preferred method of picking up remaining media? vacuuming
When cleaning up after blasting what is the alternate method of picking up remaining media? remove media with low pressure (under 30 PSI) or water wash
For safety measures in PMB operations what is done to prevent build up of explosive dust mixtures? adequate air flow and ventilation
What PPE is required for cabinet blasting? safety glasses, hearing protection, dust/particulate type respirator/mask, steel toed shoes, coveralls
What PPE is required for booth blasting? Tyvek or cotton coveralls;leather shoulder cover, leather and disposable nitrile gloves, steel toed shoes, ear plugs, blasting helmet with supplied air.
Where should your blast direction be in the booth? only at object being blasted
How far should sources of ignition be from the booth? 50ft
For corrosion treatment what TO should you use to clean the surface? TO 1-1-691
For corrosion treatment what TO should you use to spot clean the surface using a solvent wipe? TO 1-1-8
What test should you use to verify a clean surface? water break test
How would you know if the surface is dirty using the water break test? water gathers into separate droplets within 25 seconds, water forms continuous film and flashes out suddenly over large area
How do you know if the surface is clean using a water break test? water droplets merge into a continuous film without sudden flash out.
What is the next step once the surface has passed the water break test? passivate
What is used to passivate the surface on aluminium and its alloys? Chromate conversion coating (alodine)
What should you use to mix alodine? clean stainless steel, plastic, or rubber container
How much should you alodine should be mixed? only enough for the job
When should alodine be applied? immediately after rinsing corrosion removal compound from surface
How can alodine be applied? with a fiber bristle brush, sponge, cloth, spray or immersion
How long does passivation using alodine take? 1-5 min
How do you know if the alodine is brand new? takes only 1 min
When applying alodine to the surface, how would you know if the surface is dirty or corroded? the surface turns green
How do you know if the passivation using alodine has been properly applied? proper adhesion is indicated by a brassy yellow color
How long should the alodine coating air dry for? 2 hours
Once passivation has been completed using alodine, when should the final paint system be applied? within 48 hours
What do you have to do is the passivation has passed its maximum paint application time limit? re-apply passivation
What should the passivation solution not come in contact with and what would result? thinners, acetone, or other combustible materials as a fire could result
When applying alodine to the surface what PPE is required? Air purifying with HEPA filter, butyl rubber gloves, ear plugs, safety goggles or face shield, rain suit, safety toed shoes.
What are the 3 classes of HVLP spray equipment? suction feed, pressure feed, gravity feed
On the HVLP gun what pressure is used to assist in delivering paint to the spray nozzle? low pressure air generally below 20 PSIG
What air pressure is used to atomize paint at the spray head? 1-10 PSIG
What does low air pressure do to the coating material? Atomizes coating material and increases transfer efficiency
What typically holds 1qt and is most convenient for painting in small areas? Fluid cup
What are two ways the fluid supply in the fluid cup is fed to the HVLP gun? Siphon/suction fed and Gravity fed
What are the three parts of the nozzle assembly on the HVLP gun? Air cap, Fluid tip, and fluid needle
What does the air cap do on the HVLP gun? Wing ports (horns) on the air cap push air out and the cap rotates 90° to desired direction of travel
What does the fluid tip do on the HVLP gun? pushes coating material out and mixes with air to atomize fluid
What does the fluid needle do on the HVLP gun? when the needle is moved back it releases the fluid
What is important about the fluid needle and air cap? they should come as a matched set
What does the spray pattern adjustment screw do and where is it located on the HVLP gun? adjusts the width of spray pattern and is located at the rear of the spray head assembly "top dial"
When adjusting the width of the spray pattern on the HVLP gun, what direction increases the width of the pattern and decreases the width of the pattern? clockwise decreases width and counter clockwise increases width.
What does the fluid needle adjustment screw do and where is it located? adjusts the flow of fluid and is located at the rear of the spray head assembly "lower dial"
When adjusting the width of the fluid flow on the HVLP gun, what direction increases the width of the flow and decreases the flow of the fluid? clockwise decreases flow and counter clockwise increases flow.
What is the first step in inspecting your equipment before painting? inspect the gun
What things should you inspect on the gun before painting? defective hoses and couplings, loose connections, loose air cap, cleanliness, proper seating of the needle
What PPE is required when operating the HVLP gun? Air-purifying with Organic Vapor (OV) cartridges, disposable nitrile gloves, ear plugs, safety goggles or face shield, tyvek or cotton coveralls, safety toed boots
When manually cleaning the HVLP suction fed gun what should you use to clean it? thinner or solvent
What should never use when cleaning the HVLP gun? metal objects
After cleaning the gun what is done to clean any remaining paint in the gun? reassemble and spray clean thinner through it
What PSI is used for the spray gun cleaning unit? 50 PSI
How long should you operate the spray gun cleaning unit? 1-5 min
What are the steps, when servicing the spray gun cleaning unit? Drain fluid, dispose fluid IAW local, state, and federal guidelines, clean tank and replace fluid, replace filter and clean canister IAW manufacturer's specs.
Where should you dispose of excess cleaning or paint materials? Accumulation points
When disposing of excess cleaning and paint materials what should you do first before pouring excess into containers? ensure the container is grounded.
What are some paint defects? pinhole cavities, peeling, blistering, fisheyes, pitting and cupping, crazing, mud cracking and checking, sand paper finish.
What causes pinholes? incompatible thinner, insufficient primer dry time, oils and solvents trapped, dirty surface
What causes peeling? grease, oil, or water on the surface
What causes blistering? moisture in the air lines
What causes fisheyes? silicon products or other contaminants left on the surface
What causes pitting and cupping? corrosion left on the surface, poor surface prep, trapped solvents from improper proportions
What causes crazing, mud cracking, and checking? painting over hard glossy coat, too much catalyst, too much heat when forced drying, insufficient drying times between coats
What causes a sandpaper finish? insufficient scuffing, dry spray, overspray or painting too far from surface, excessive dirt in spray areas, improperly cleaned paint lines (pressure pot)
What are techniques of applying paint? do not arc or wave, 90° from surface, 6-10 inches from surface, fully depress trigger, maintain speed, 50% overlap
What are causes of runs or sags? not releasing the trigger, stroking too close, gun not at 90° angle, dirty air cap or fluid tip, coating material cold, coating applied to heavily
What are causes of streaks? not overlapping correctly, not maintaining 90° to surface, air pressure too high
What are causes of orange peel? using wrong air cap or fluid nozzle, stroking too far from surface, overspray, coating too thick, coating material too cold, insufficient air pressure
What are two adjustments that always need adjusting before painting on the HVLP gun? spray pattern adjustment and fluid adjustment
What are some spray pattern defects? heavy center, split spray, heavy top or bottom, wrinkling, blushing, faulty finishing material
What causes heavy center? pattern too small, low atomizing pressure, fluid pressure too high, air nozzle too large for fluid used.
What causes split spray? atomizing pressure high, fan patter too wide,
What causes heavy top or bottom? air cap clogged
What causes wrinkling? combination of factors: coatings applied too fast/too thick, possibly caused by humidity and rapidly rising TEMPS when painting out doors
What causes blushing? result of moisture condensation from the atmosphere within / on drying organic film
What causes faulty finishing material? improper storage, expired material
When troubleshooting a spray gun what is the first thing you check if paint doesn't spray and what are the other items you check? Check if there is paint first then check if the tip is blocked and if the needle is operating.
When troubleshooting a spray gun, what do you check if the paint is not transferring from the cup? dirty fluid tip and air cap, clogged air vent on the cup cover, incorrect air cap, leaking connector on fluid tube nozzle
What causes excessive fog? pressure too high, coating too thin, spraying too far beyond surface, wrong air cap or fluid tip, stroking too far from the surface
What causes paint from leaks from the gun? needle and the fluid tip different or damaged, packing is dried or nut for the needle is too tight
What causes the gun to sputter? fluid tip loose.
What spray system has paint supply attached to the gun? attached system
What spray system has paint supply separate from the gun? separate system (pressure pot)
What system is used for large volume painting? pressure pots
What is the capacity of pressure pots? 2qts to 120 gallons
What on the pressure pot adjusts the material flow rate? pressure/material regulator
What is the purpose for pressure pots? large volume painting, uniform pressure, constant flow rate
When does the agitator do on the pressure pot? keeps paint suspended
What is the purpose of a spray booth? a fireproof compartment, room or enclosure built to confine and remove fumes and overspray during the paint spraying process
What does the partially enclosed spray booth called and what does it do? cross flow and moves air towards filters across the booth
What direction does the air move in a down draft spray booth? airflow in a downward direction
What air velocity do most spray booths operate on? 100 FPM
What type of spray booth is the most common type in the Air Force? dry filter/baffle
What are the major components of the spray booth? exhaust fan, air replacement unit, manometer
What does a manometer do? a draft gauge that monitors air velocity and indicates when paint arrestor filters or intake filters are filled to capacity
When cleaning and maintaining a spray booth, what will a well maintained booth provide? A well maintained spray booth will provide positive results on continuous basis with simple day to day cleaning and maintenance
What is the minimum PPE used when handling materials and cleaning the booth? eye and hand (nitrile gloves) protection is required
What TO should you use to clean the surface before painting? 1-1-691
What are the steps of surface prep for an unpainted surface? clean, passivate, tack rag
What are the steps of surface prep for a painted surface? Scuff sand, re-clean, passivate if needed, tack rag
What is required on a primer surface after it has dried for 8 hours? wipe down with approved solvent to reactivate primer, tack rag
What is required on a primer surface after it has dried for 24 hours? Scuff sand, wipe down with approved solvent to reactivate primer and tack rag
What is the preferred method to agitate the resin and stir the catalyst for the primer? mechanical shaker for 3-5 min
How much primer should you mix? only what can be used in 4 hours
What is the dwell time for primer? 30 min
Why should you allow dwell time for primer? allows resin and catalyst to combine
What do you use to check viscosity? #4 ford cup or #2 ZAHN CUP
How long should the paint come out of the #2 Zahn cup to have the correct amount of viscosity? 17-23 seconds
What TO should you use to select the proper top coating? -23 TO
Once the surface is passivated when should you apply the primer? within 48 hours
For a single coat or primer, what is the dry film thickness (DFT)? .6.-.9 mils DFT
For drying times of primer, what is meant by tack free? surface of the film will not finger print
When applying the top coat how should you apply the coating? Apply one wet cross coat at 1.7 to 2.3 dry film thickness (DFT)
How long should you wait before handling, taping or masking the top coat? 6 hours
How long should you wait for paint to cure before moving painted surfaces from a controlled environment? 6 hours
How long should you wait for paint to cure before applying decals? 8 hours
How long should you wait for paint to cure before engine run up? 30 hours
How long should you wait for paint to cure before a wet tape test? 48 hours
How long should you wait for paint to cure before first flight? 72 hours @ above 75°F
When performing mx painting how long should paint cure on complete leading edges (all), complete control surface (all), major skin panels 9 sqft and over, and engine intakes? 72 hours
When performing mx painting how long should paint cure on skin panels 9 sqft or less, fasteners, rivet heads, screw heads, and minor chipped and scratched areas less than 36 sq inches? 30 hours
When cleaning the HVLP gun what should you not do and why? submerge the gun in thinner because it will dry out needle packing and will cause gun to leak
What TO is used to apply and remove coating? TO 1-1-8
What TO is used to clean a surface? TO 1-1-691
Created by: comso9o