Painting Guide

 

 

Common Defects

Ways of preventing some of the common defects:

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