Other than the general considerations for cement plaster, skimmed plaster needs to be assessed according to age and texture. Some patent plasters are trowelled to be so smooth, compact and hard that there is an almost marble-like finish to the wall.

However, special care must still be exercised when choosing a primer, as there is often a layer of fine powder on these surfaces.

Preparation

New plaster
Before starting to paint

• fill in all cracks and imperfections
  
• sand till smooth
  
• remove all dust

Previously lime washed or distempered plaster

• Remove all coatings to reveal the bare plaster with a wire brush. Alternatively the coatings can be removed by scraping or high-pressure water blasting.
  
• Fill all cracks and imperfections and sand down till smooth when the plaster is dry.

Previously oil or enamel painted plaster
If the original paint is in bad condition:

• remove all traces of it
  
• wash the walls down with concentrated detergent and rinse
  
• allow to dry thoroughly
  
• fill in all cracks with a recommended crack filler
  
• sand smooth when dry

If the existing paint is in good condition:

• wash the walls down with a sugar soap solution and rinse clean
  or
  
• use a suitable solvent to remove dirt, grease, wax polish or any other contaminants.
  

For product recommendations, advice or enquiries please contact us or call our toll-free help line on 0800 222 423.

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