Common Painting Defects

– Low Coverage:

Causes:

– Improper thinning and application.
– Rough texture of plaster
– Highly absorbent surface.
– Top coating directly over putty without applying primer.

Prevention:

Please read instructions on shade card or product packaging. Follow recommended instructions.

– Blistering:

Causes:

– Trapped gases or moisture in paint film (might be in enamels).

Prevention:

Follow the specified recoating time interval. Top coat application should not give too thick film.

– Poor Adhesion:

Causes:

– The paint was applied over greasy, oily, or too smooth a surface.
– Application over loose particles such as rust or dust.
– The previous coating was not sanded properly.
– Application over partially dried coat.

Prevention:

Proper surface preparation.

– Chalking:

Causes:

– The paint was applied over greasy, oily, or too smooth a surface.
– Application over loose particles such as rust or dust.
– The previous coating was not sanded properly.
– Application over partially dried coat.

Prevention:

Proper surface preparation.

– Sags and Runs:

Causes:

– Application of excessively thick coat.
– Use of a wrong thinner.

Prevention:

Apply finish coat using recommended thinner. Do not apply thick coats.

– Brush Marks:

Causes:

– Poor quality brushes were used for the painting.
– Careless application.
– Highly viscous paint.

Prevention:

Use proper brushes and a thin paint. Sand the surface to get a smooth finish.

– Patchiness:

Causes:

– Application of finish coat over spot puttied surfaces.
– The surface had high alkalinity
– The putty was not completely dry.
– Thick coat of putty was applied.

Prevention:

– Allow new walls to get cured for at least three months.
– Apply thin coats of putty.
– Always apply a primer coat after applying spot putty.
– Always sandwich coats of putty with primer
– Fill up the cracks in plaster with sand cement mixture.

– Yellowing:

Causes:

– The paint film is not getting natural sunlight particularly for enamels.
– Or the paint film is receiving too much sunlight.

Prevention:

– Clean the surface and repaint.
– Improved daylight and ventilation for inside work.

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