Paint Problems

Below, find a range of painting problems that people face when painting.

 

efflorescence

 Efflorescence

What is it?

  • Soluble alkaline salts draw from mortar, sand and brick to the surface crystallize to form a deposit.
  • The deposit can take the shape of a either a thin hard film or profuse fluffy  growth

Risk

  • Depends on the type of painting being applied, but may interrupt with drying process or result in discolouration.

Treatment

  • Patience – the salt deposit should be removed using coarse cloth every 7 days
  • This process is to be repeated until the salt deposit no longer continues to surface
 wall-fungal-growth

 Fungal Growth

What is it?

  • Algae, moss, lichen and mould
  • Visible as a black, brownish or green growth

Risk

  • Prevents paint adhering to the wall surface, will result in paint peeling off shortly after application

Treatment

  • Scrape off with cleaning knife or hard brush
  • Wash off with bleach, using liberally. Do not rinse immediately
  • Leave for 48 hours and then wash down walls with water.
  • Repeat till 100% removal

 

 Saponification

What is it?

  • Results from high alkaline cementitious surfaces (brickwork, cement, mortar)
  • Gypsum plasters are not generally alkaline unless gauged with lime
  • High alkalinity attacks oil-based paints

Risk

  • Oil-based paints are softened and liquefied by highly alkaline moist surfaces, resulting in complete application failure

 Treatment

  • Allow sufficient drying time
  • For oil-based paints, the surface should first be primed with an alkali-resistant primer. This primer helps protect the oil-based paint on the dry surface,  it does facilitate the application of the oil –based paint onto damp surfaces