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Transcript of Paint Defects
![Page 1: Paint Defects](https://reader033.fdocuments.us/reader033/viewer/2022061104/541267a47bef0ae0188b4a2e/html5/thumbnails/1.jpg)
PAINT DEFECTS
1st November 2001/aka
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CONSUMER BUYS
• THE PAINTED SURFACE
• TIME PERIOD BETWEEN TWO PAINT APPLICATION CYCLES
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BEST BUY
DEPENDS ON• THE RIGHT SURFACE CONDITION
• THE RIGHT SURFACE PREPARATION
• THE RIGHT PAINT COMPOSITION
• THE RIGHT APPLICATION WITH RIGHT TOOLS
• THE RIGHT ENVIRONMENT
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PRODUCT TRAINING PROGRAMME
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PAINT DEFECTS
STAGES OF DEFECTS
• IN WET PAINT
• DURING APPLICATION
• DURING DRYING AND CURING
• SHORTLY AFTER APPLICATION
• DURING SERVICE LIFE
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DEFECTS APPEARING IN
WET PAINTS
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PRESENTATION ON
DEFECTS
• PROBABLE CAUSES
• PROBABLE CORRECTIVES
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DEFECTS IN WET PAINTS
FOAMING• OVERSTIRRING• LOW
CONSISTENCY• TRANSPORTATION
• DUMPING OR ADDITION
• ALLOW THE MATERIAL TO STAND STILL
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GAS FORMATION-BULGING
• REACTION OF METALLIC PASTE
BASIC PIGMENTS
BINDERS• PUTREFACTION• MOISTURE• STORAGE
TEMPERATURE
• CAREFULLY
ALLOW GAS TO GO OUT
• CHECK VISCOSITY IF IT CAN BE
ADJUSTED FOR USE
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GELLED
• REACTION ON STORAGE
• EXPOSED TO HIGH TEMPERATURE
• MOISTURE
• DISCARD
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HARD SETTLING
• OLD MATERIAL• HEAVILY
PIGMENTED• LOWER
CONSISTENCY• STORAGE IN
ELEVETED TEMPERATURE
• STIR WELL FOR LONGER TIME
• USE GYROSHAKER
• KEEP TIN UPSIDE DOWN FOR SOME TIME
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LUMPS
• SMALL
• BIG
• HARD
• SOFT
(Distempers)
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LUMPS
• MATERIAL IS EXPOSED TO AIR FORMING SKINS AND / OR SMALL LUMPS
• MIX WELL FOR LONG TIME
• FILTER THE MATERIAL BEFORE USE TO AVOID LUMPS
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MEDIUM SEPARATION
• MATERIAL IS OLD• TENDENCY
EXIBITED BY MANY FORMULATIONS
• IT IS NOT A QUALITY RELATED ISSUE
• MIX WELL AND USE
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PUTREFACTION
UNPLEASANT SMELL• MICROBIAL
CONTAMINATION FROM RM,WATER USED;MATERIAL LEFT EXPOSED AFTER THINNING WITH WATER
• IF THERE IS NO CHANGE IN CONSISTENCY USE MATERIAL;
OTHERWISE DISCARD
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SKINNING
• MORE ULLAGE• LEAKAGE OF AIR• FAULTY
FILTRATION• PART OF PAINT
REMOVED AND LID IS NOT TIGHTLY CLOSED
• COVER THE TOP LAYER WITH SMALL QUANTITY OF THINNER
• FILTER WELL PRIOR TO USE
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SYNERESIS WATER/LIQUID SEPARATION
• OLD MATERIAL• LOW
CONSISTENCY• OVERTHINNING
OF MATERIAL
• MIX WELL AND USE
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•THIN IN CONSISTENCY
• INEFFECTIVE STIRRING WHILE ASSESSING CONSISTENCY
• DROP IN VISCOSITY ON STORAGE
• SYNRESIS
• MIX WELL AND USE
• HAVE A SKILLED BRUSHMAN TO AVOID SAGGING
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PICKUP IN CONSISTENCY THICKENING/ VISCOUS MATERIAL
• REACTION• EXPOSED TO
HIGH TEMPERATURE
• MOISTURE
• ADJUST CONSISTENCY AND USE
• IT MAY TAKE MORE THINNER AFFECTING OPACITY
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DIFFICULTIES DURING
APPLICATION OF PAINT
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BITTY FILM
• DUSTY SURROUNDINGS
• UNFILTERED MATERIAL
• SEEDING-OVERTHINNING RAPIDLY
• UNSUITABLE THINNER
• SEEDING WILL RESULT BITTY FILM
• IN OTHER CASES FILTER AND USE
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BLEEDING
• USE OF IMPROPER PRIMER OR THINNER ( STRONG
SOLVENTS)• INSUFFICIENT
CURING OF BASE COAT
• USE OF LOCAL DYES/ STAINED WOOD
• RIGHT THINNER• RIGHT
UNDERCOAT• CURE WELL• PROPER QUALITY
OF WOOD
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BLOOMINGOR HAZE
• IMPROPER THINNER
• POOR VENTILATION
• CONTAMINATION• HIGH HUMIDITY• CONDENSATION
ON SUBSTRATE
• RIGHT THINNER• GOOD
VENTILATION• AVOID
CONTAMINATION
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BLUSHING
• ACTION OF MOISTURE / WATER UNDER HIGH HUMIDITY
• WARM THE PARTS BEFORE PAINTING TO ,SAY AT 40ºC
• FORCE DRY THE FRESH FILM DURING COOLER DAYS
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BRUSH CLOGGING
POOR BRUSH CLEANING
(DISTEMPERS)
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BRUSH CLOGGING
• HARD WATER• USE OF BRUSH
PARTIALLY USED-UNCLEANED
• USE SOFT WATER• MAINTAIN BRUSH
PROPERLY
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BRUSH MARKS
• HIGH CONSISTENCY
• WRONG THINNER
• MATERIAL DRIES FAST
• HIGH SURROUNDING TEMP
• POOR QUALITY OF BRUSH
• POOR WORKMANSHIP
• PROPER CONSISTENCY
• RIGHT THINNER
• QUALITY BRUSH
• GOOD WORKMANSHIP
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HARD TO BRUSH
• IMPROPER THINNER
• TEMP HIGH (Evaporation of solvents)
• HIGH CONSISTENCY(Tin left opened)
• LOWER TEMP(Visc pickup)
• POROUS SUBSTRATE
• FIRST COAT SOFT
• RIGHT THINNER
• RIGHT WEATHER
• CURING OF UNDERCOAT
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CISSING
• CONTAMINATION• POOR WETTING
(at end of pot life)• PAINT IS TOO
THIN
• GOOD SUBSTRATE PREPARATION
• RIGHT CONSISTENCY
• AVOID CONTAMINATION
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DIFFICULT TO MIX WITH WATER
(WATER BASE PAINTS)
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DIFFICULT TO MIX WITH WATER
• HARD WATER• HIGH
CONSISTENCY• DUMPING OF
PASTE IN WATER
• USE SOFT WATER• MIX SLOWLY AND
WELL
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LIFTING OF UNDERNEATH FILM
(AFTER THE APPLICATION OF TOP COAT)
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LIFTING OF UNDERNEATH FILM
• STRONG SOLVENTS IN TOP COATS
• IMPROPER CURING OF UNDERCOAT
• APPLICATION OVER UNCLEAN SURFACE
• PROPER THINNER• CURE
UNDERCOAT• RIGHT
COMPOSITE SYSTEM
• USE TIE COAT
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ORANGEPEEL EFFECT
• IMPROPER THINNER
• SETTING OF GUN
• FILM SETS FAST
• LOW FILM OR TOO HIGH DFT
• SUBSTRATE TEMP HIGH
• UNDERCOAT NOT DRIED WELL
• PROPER THINNER• CURING OF
UNDERCOAT• RIGHT
ATMOSPHERE• GOOD
WORKMANSHIP
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PINHOLES
• CONTAMINATION• WETTING POOR
(Two Pack)• SILICON
CONTAMINATION• POOR FLOW
• AVOID CONTAMINATION
• GOOD WORKMANSHIP
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POOR SPREADING CAPACITY OR POOR COVERING CAPACITY
• APPLICATION AT HIGHER CONSISTENCY -THICK FILM
• IMPROPER THINNER
• HIGH ABSORPTION DUE TO POROUS SUBSTRATE
• GOOD WORKMANSHIP
• RIGHT THINNER• SEAL THE
SUBSTRATE TO REDUCE POROSITY
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POOR HIDING
• OVERTHINNING• LOWER DFT• CONTRAST OF
BASE COLOR• SETTLED MASS IN
A CAN NOT FULLY MIXED
• FLOCCULATION OF PIGMENT
• MIX WELL• GOOD
WORKMANSHIP• APPLY PRIMER
TO REDUCE CONTRAST
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SAGGING
• IMPROPER THINNER
• HIGH DFT
• GUN SETTING
• PAINT OVER GLOSSY SUBSTRATE
• WET PLASTER
• INSUFFICIENT MIXING OF PAINT ( SETTLED MASS )
• POOR VENTILATION
• GOOD WORKMANSHIP
• RIGHT THINNER• PROPER SURFACE
PREPARATION
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WRINKLING
• THICKER FILM BUILDUP
• HIGH TEMP• VISCOUS
MATERIAL• SURFACE DRY
WITH TRAPPING OF SOLVENTS
• CONTAMINATION
• GOOD VENTILATION
• AVOID CONTAMINATION
• GOOD WORKMANSHIP
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FAULTS RELATED TO
DRYING & CURING
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DISCOLORATION DUE TO OVERBAKING,OR YELLOWING DUE TO
OVERBAKING
• BAKING AT HIGHER TEMPERATURE
• BAKING FOR LONGER DURATION
• CONTROL PROPER SCHEDULE
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SLOW DRYING
• HIGHER DFT• LOW
SURROUNDING TEMP
• HIGH HUMIDITY• CONTAMINATION
OF OILY ,WAXY MATERIAL
• IMPROPER THINNER
• GOOD SURFACE• RIGHT THINNER• RIGHT
ATMOSPHERE• GOOD
WORKMANSHIP
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SOFT FILM FILM IS CHEESY
• HIGHER DFT• LOW
SURROUNDING TEMP
• IMPROPER THINNER
• CONTAMINATION WITH OIL WAX
• RIGHT THINNER• GOOD
VENTILATION• RIGHT
ATMOSPHERE• GOOD
WORKMANSHIP
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FILM IS TACKY FILM IS STICKY
• HIGHER DFT• LOW
SURROUNDING TEMP
• IMPROPER THINNER
• CONTAMINATION• SAPONIFICATION• DAMP WALL
• RIGHT THINNER• RIGHT
ATMOSPHERE• SEAL ALKLINITY• GOOD
WORKMANSHIP
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BLISTERS
• IMPROPER THINNER• AERATION IN PAINTS• MOISTURE
CONTAMINATION• THICK FILM WITH
ENTRAPPED SOLVENTS
• WATERLOVING SALTS IN BASECOAT
• MOISTURE MORE THAN 12%
• RIGHT THINNER
• SEASONED WOOD
• AVOID CORROSION
• RIGHT DFT
• PROPER CURING
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COLOR STREAKS
• UNDISPERSED TINTERS
• PIGMENT FLOCCULATION
• NON UNIFORM BRUSHING
• GOOD WORKMANSHIP
• PROPER MIXING OF MATERIAL
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DEFECTS SHORTLY
AFTER APPLICATION
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FINISH OF THE FILM
GRITTY OR ROUGH OR FINISH OF THE FILM
POOR
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FINISH OF THE FILM POOR
• UNFILTERED MATERIAL
• UNCLEAN SUBSTRATE• DUSTY SURROUNDING• DUMPING OF
THINNER• STIRRED-IN-SKIN• PIGMENT
FLOCCULATION
• FILTER WELL• CLEAN
ENVIRONMENT• SELECT AND ADD
RIGHT AMOUNT OF THINNER
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MATTENING OF THE FILM
DIFFERENCE IN SHEEN/MATTNESS
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MATTENING OF THE FILM
• IMPROPER THINNER
• THIN FILM• HIGH POROSITY
OF THE SUBSTRATE OR PRIMER/UNDER
COAT
• SEAL THE SUBSTRATE
• SELECT PROPER THINNER
• GOOD WORKMANSHIP
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PATCHINESS
• NON UNIFORM ABSORPTION
• NONUNIFORM APPLICATION OF PRIMER
• POOR PUTTY WORK
• THIN FILM
• POOR DISPERSION OF TINTERS
• POOR WORKMANSHIP
• UNIFORM DFT• PROPER MIXING
AND STIRRING• CORRECT
APPLICATION• QUALITY TOOLS• SEALING OF
SURFACE
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POOR ADHESION
ADHESION ON GALVANISED,COPPER OR
ALUMINIUM
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POOR ADHESION
• POOR SURFACE PREPARATION
• ETCH PRIMER?
• PRETREATMENT CHEMICALS
• CHALKY SURFACE
• CONTAMINATION
• POOR CURING OF UNDERCOAT
• INCOMPATIBILITY OF COATS(THERMOPLASTIC VS THERMOSETTING)
• SELECT RIGHT SYSTEM
• GOOD SURFACE PREPARATION
• CURE WELL THE COATS APPLIED IN BETWEEN
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POOR GLOSS
• INCOMPATIBLE THINNER
• POOR VENTILATION
• VERY THIN COAT• HIGH
ABSORPTION OF THE SURFACE
• PRIME THE SURFACE
• USE PROPER THINNER
• ENSURE GOOD VENTILATION
• GOOD WORKMANSHIP
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SHADE VARIATION
• NONUNIFORM FILM DEPOSIT
• COLOR OF THE U/C• NO. OF COATS
APPLIED• FLOCCULATION• DIFFERENCE IN
APPEARANCE OF TOP COAT(GLOSS)
• CONTAMINATION WITH OTHER COLOR
• MIX THE MATERIAL WELL
• GOOD WORKMANSHIP
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REDUCED SHEEN(LUSTRE FINISH)
• IMPROPER THINNER
• ABSORPTION OF UNDERCOAT / SURFACE
• NONUNIFORM DFT
• SETTLED MASS IN CAN-?
• MIX WELL • SELECT RIGHT
THINNER• GOOD
WORKMANSHIP
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DEFECTS DEVELOPED DURING
SERVICE LIFE
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ALGAE GROWTH
• PRETREATMENT TO THE AFFECTED SURFACE PRIOR TO PAINTING
• MOIST/HIGH HUMIDITY
• DAMP SURFACE
• TREAT WITH BIOWASH
• AVOID DAMP WALL
• STOP THE LEAKAGE OF WATER
• GOOD WEATHER
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CHALKING
• IMPROPER SURFACE ABSORPTION
• OVERTHINNING OF W/B -SETTLING
• UV RADIATION
• TOO THINLY APPLIED FILM
• SALTY ATMOSPHERE
• SELECT RIGHT PRODUCT
• GOOD WORKMANSHIP
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CHECKING & CRACKING
• SEVERE WEATHER CONDITION
• OVERAGEING OF FILM
• DIFFERENCE IN STRESS AND STRAIN IN MULTICOAT SYSTEM
• SELECT RIGHT PAINT COMPOSITE SYSTEM
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EFFLORESCENCE
• SEEPAGE OF WATER THROUGH WALL-SALTS DEPOSITION
• SALTS FROM BRICKS
• UNWASHED SAND IN MORTERS OR CEMENT ADDITIVES
• STOP SEEPAGE• REMOVE POWDER• WASH WELL• DRY SURFACE• PRIME AND
APPLY
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FUNGUS GROWTH OR MOULD GROWTH
• AFFECTED SURFACE PRIOR TO PAINTING
• HIGH HUMIDITY• LACK OF
SUNSHINE• POOR
VENTILATION• DAMP ROOMS
• TREAT WITH BIOWASH
• SELECT RIGHT SYSTEM
• RIGHT WEATHER CONDITIONS
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PEELING & FLAKING• DIFFERENTIAL STRESS
AND STRAIN IN MULTICOAT SYSTEM
• PREMATURE DETACHMENT OF U/C
• POOR ADHESION• UV EXPOSURE• POOR SUBSTRATE• DAMP PLASTER• EFFLORESCENCE
• RIGHT PAINT SYSTEM
• RIGHT SURFACE PREPARATION
• GOOD WORKMANSHIP
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RUSTING
• RUSTY SURFACE• POOR QUALITY
OF PRIMER• HIGH HUMIDITY• CORROSIVE
ATMOSPHERE
• RIGHT PAINT SYSTEM
• RIGHT SURFACE PREPARATION
• GOOD WORKMANSHIP
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DARKENING OF SHADE
• OVER EXPOSURE TO SUNLIGHT
• ALKALINE -ACIDIC CONTAMINATION
• LOSS OF GLOSS
• RIGHT PRODUCT SELECTION
![Page 67: Paint Defects](https://reader033.fdocuments.us/reader033/viewer/2022061104/541267a47bef0ae0188b4a2e/html5/thumbnails/67.jpg)
FADING OF SHADESHADE IS BECOMING LIGHTER
• OVEREXPOSURE TO SUNLIGHT
• TINTED WITH LOCAL COLORANTS
• MOISTURE
• CHALKING MASKS
• LOSS OF GLOSS
• ACIDIC CONTAMINATION
• RIGHT PAINT SYSTEM
![Page 68: Paint Defects](https://reader033.fdocuments.us/reader033/viewer/2022061104/541267a47bef0ae0188b4a2e/html5/thumbnails/68.jpg)
YELLOWING OF SHADE• INADEQUATE EXPOSURE
TO SUNLIGHT
• ADDITION OF GLAZE VARNISH
• UNDERNEATH SURFACE RUSTY
• OVERBAKING
• CONTAMINATION-AMMONIA
• PAINTED AREA PARTIALLY COVERED
• GOOD SURFACE PREPARATION
• RIGHT PAINT SYSTEM
![Page 69: Paint Defects](https://reader033.fdocuments.us/reader033/viewer/2022061104/541267a47bef0ae0188b4a2e/html5/thumbnails/69.jpg)
THANK YOU