Copyright 2003, TWI Ltd World Centre for Materials Joining Technology
B.G.A.S. PAINTING INSPECTION
PAINT FAULTS, BITTINESS
INCLUSIONS, EITHER
AIRBORN OR FROM
THE PAINT ITSELF.
COULD BE PARTIALLY
CURED PAINT, OUT
OF SHELF LIFE.
Copyright 2003, TWI Ltd World Centre for Materials Joining Technology
B.G.A.S. PAINTING INSPECTION
COATING FAULTS BLEEDING
THE SOLVENT FROM
THE TOP COAT
SOFTENS THE UNDER
LYING MATERIAL
AND ALLOWS IT TO
PASS INTO AND
THROUGH THE
LAYER, CAUSING
DISCOLOURATION.
BROWN FOR
BITUMEN, BLACK FOR
COAL TARS.
Copyright 2003, TWI Ltd World Centre for Materials Joining Technology
B.G.A.S. PAINTING INSPECTION
COATING FAULTS BLISTERING
BLISTERS CAN BE FILLED WITH GAS,LIQUID OR
CRYSTALS
Copyright 2003, TWI Ltd World Centre for Materials Joining Technology
B.G.A.S. PAINTING INSPECTION
COATING FAULTS CHALKING
DEGRADATION OF A
BINDER DUE TO
DISRUPTIVE FACTORS
IN THE ENVIRONMENT
Copyright 2003, TWI Ltd World Centre for Materials Joining Technology
B.G.A.S. PAINTING INSPECTION
COATING FAULTS CISSING
CAUSED BY
INADEQUATE
SURFACE
PREPARATION.
A DIFFERENCE IN
SURFACE ENERGY
CAUSES LOCAL LACK OF
ADHESION.
Copyright 2003, TWI Ltd World Centre for Materials Joining Technology
B.G.A.S. PAINTING INSPECTION
COATING FAULTS CRACKING
COATING AGE AND
DIFFERENTIAL
EXPANSION
Copyright 2003, TWI Ltd World Centre for Materials Joining Technology
B.G.A.S. PAINTING INSPECTION
COATING FAULTS CRATERING
BOWL SHAPED
DEPRESSIONS. CAUSED
BY ESCAPING SOLVENT
OR GASES. PAINT IS OF
TOO LOW A VISCOSITY
TO FLOW AND FILL THE
DEPRESSIONS
Copyright 2003, TWI Ltd World Centre for Materials Joining Technology
B.G.A.S. PAINTING INSPECTION
COATING FAULTS CURTAINS, SAGS, RUNS AND TEARS
CAUSED BY OVER
APPLICATION. REMOVE
OFFENDING EXCESS
MATERIAL, LIGHTLY
ABRADE, RECOAT.
Copyright 2003, TWI Ltd World Centre for Materials Joining Technology
B.G.A.S. PAINTING INSPECTION
COATING FAULTS FLAKING
MATERIAL
PROGRESSIVELY
GETS BRITTLE WITH
AGE, CRACKS AND
BEGINS TO DETACH
Copyright 2003, TWI Ltd World Centre for Materials Joining Technology
B.G.A.S. PAINTING INSPECTION
COATING FAULTS HOLIDAYS
DEFINED AS BEING :-
A VOID, A MISS, OR
AN UNCOATED AREA
Copyright 2003, TWI Ltd World Centre for Materials Joining Technology
B.G.A.S. PAINTING INSPECTION
COATING FAULTS LIFTING
CAUSED BY SOLVENT STRENGTH AND ALSO LACK OF
OBSERVANCE OF STATED OVERCOATING TIME
Copyright 2003, TWI Ltd World Centre for Materials Joining Technology
B.G.A.S. PAINTING INSPECTION
COATING FAULTS ORANGE PEEL
SIMILAR APPEARANCE TO A
CITRUS FRUIT SKIN
CAUSED BY PAINT VISCOSITY PROBLEMS OR BY
APPLICATOR TECHNIQUE
Copyright 2003, TWI Ltd World Centre for Materials Joining Technology
B.G.A.S. PAINTING INSPECTION
COATING FAULTS ROPINESS
BRUSHMARKS
Copyright 2003, TWI Ltd World Centre for Materials Joining Technology
B.G.A.S. PAINTING INSPECTION
COATING FAULTS WRINKLING AND
RIVELLING
