Diagnose your painting problems

Solution-to-Chalking-Problem-College-Pro-Painters

Diagnose your painting problems with our detailed list of common defects, their causes and simple prevention measures. Here are a few ideas to plan and have your painting job done in a more organised way.

Low Coverage

Causes :

  • Improper thinning and application.
  • Highly absorbent surface.
  • Rough texture of plaster.
  • Top coat application directly over putty without application of primer.

Prevention:

  • Please read instructions on shade card or product packaging or refer to “Features and Application” section. Follow recommended instructions on application procedures and thinning.

Blistering

Causes :

  • Caused by trapped moisture or gases in paint film (more likely in enamels).

Prevention :

  • Follow the specified recoating time interval.
  • Top coat application should not result in too thick a film at a time.

Remedy :

  • Smooth sand the surface and then repaint it.

Poor Adhesion

Causes :

  • Application of paint over oily, greasy or very smooth surface.
  • Application over loose particles like dust or rust.
  • Not sanding previous coat of gloss paint.
  • Application over partially dried coat.

Prevention :

  • Ensure proper surface preparation.

Remedy :

  • Surface should be repainted.

Chalking

Causes :

  • Application of paint over oily, greasy or very smooth surface.
  • Application over loose particles like dust or rust.
  • Not sanding previous coat of gloss paint.
  • Application over partially dried coat.

Prevention:

  • Ensure proper surface preparation.

Remedy:

  • Surface should be repainted.

Orange Peel

Causes :

  • Application of top coat paint in highly viscous form.
  • Use of improper thinner.

Prevention:

  • Sufficient drying time between coats.
  • Use recommended painting system.

Remedy:

  • Scrape out orange peel and repaint.

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.

Remedy:

  • Sand surface to smoothen the sagged areas and repaint.

Brush Marks

Causes :

  • Applying paint using poor quality brushes.
  • Highly viscous paint.
  • Careless application.

Prevention:

  • Use proper brushes and thin paint to desired proportion.

Remedy:

  • Sand surface to a smooth finish and apply paint (after thinning to desired proportion).
  • Use good quality brushes.

Checking and Chalking

Causes :

  • Cracking of plaster.
  • Application of matt finish over glossy undercoat finish.
  • Application of finish coat before drying of the under coat.
  • Applying quick hard dry coats over a soft one.

Prevention:

  • Undercoat and top coat of paint should have identical physical properties.
  • Allow drying time between two coats.

Remedy:

  • Entire coat must be completely removed.
  • Exposed base should be then rubbed down to a smooth face and primed before repainting.

Cissing

Causes :

  • Small impurities in paint (oil, grease) visible at the centre of the hole.

Prevention:

  • Clean surfaces prior to sanding and remove all sanding dust.

Remedy:

  • Remove paint completely from affected areas and repaint.

Yellowing

Causes :

  • Paint film is deprived of natural sunlight (especially in case of enamels).
  • Paint film subjected to too much sunlight.

Prevention:

  • Use paints like Royale, Premium Emulsion.
  • Improved daylight and ventilation for inside work.

Remedy:

  • Surface should be cleaned and repainted.
  • Use recommended system.

Microbial Growth

Causes :

  • Painting over a surface affected with microbial growth.
  • Seepage or dampness in buildings.
  • Contamination of paint by materials used in putty preparation.

Prevention:

  • Before painting, area should be cleaned with 5-10 % bleach solution.
  • Use clear water for thinning and putty preparation.
  • Keep doors and windows open during and after painting.

Remedy:

  • Clean with bleach solution and repaint.

Patchiness

Causes :

  • Application of finish coat over spot puttied surfaces.
  • High alkalinity of surface (evident in new walls).
  • Incomplete drying of putty.
  • Application of thick coat of putty.

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.
  • Cracks in plaster should be filled with cement sand mixture.

Remedy:

  • Scrape the surface and repaint adopting the right surface preparation.

Leave a Reply

Your email address will not be published. Required fields are marked *