COMMON PAINT FILM DEFECTS Flashcards
Discoloration of a coating caused by soluble color in the underlying surface. May be prevented by applying an impermeable undercoating.
BLEEDING
Formation if blusters or pustules on a coating. May be due to underlying spots of grease, sap or moisture, to excessive hear or direct exposure to the sun during the process of drying.
BLISTERING
Progressive powdering from the surface inward. Always choose the right type of paint for exterior purposes.
CHALKING
Loss if luster. May be due to insufficient or defective under coats, most frequently to improper filling of wood.
DEADENING
Clouding of the lacquer film through precipitation of moisture in the film. Constant temperature and constant low humidity in the finishing room will prevent much trouble
MOISTURE BLUSH
Indicates imperfect attachment to the surface. Commin causes of this are due to dampness, greasy surfaces and moisture.
PEELING
The term describes the appearance. Causes are changes in atmospheric conditions during drying, application over sweating or incompletely dried undercoats, spots of grease or soap and cold draught.
PINHOLING
Irregulations of surface due to uneven flow of varnish or paint. Most frequent causes are too much varnish, incomplete brushing and inelastic brush.
RUNS AND SAGS
The adhesive property of incompletely dried coating. Tackiness is caused especially in the refinishing if old work, by applying a coating over a greasy or unclean surface
TACKINESS
Condition appears chiefly to application of few heavy coats for more thin ones. Also may be due to cold weather. Removal of the coats is the remedy.
WRINKLING
An incomplete form of peeling, where the paint cracks into large segments. The edges of which break away from the surface while the center remains attached. Usually due to repeated application of new coats over old coats no longer adherent.
ALLIGATORING
