Efflorescence is the appearance of salt-like deposits commonly observed on masonry walls.

    • Poor paint surface preparation where prior efflorescence was not entirely removed and washed before the surface was repainted.
    • Heavy moisture migrating through exterior masonry walls from inside the home.
    • Inadequately waterproofed basement walls allowing ground water penetration.
    • Painting masonry construction before the concrete or mortar had adequately cured and dried out.
    • In the case of porous films like emulsion paints, the salt solution can pass through the film, crystallising on the paint film. It can be brushed off the film without any harm.
    • Usually, efflorescence is the result of unrestrained moisture or water movement specifically caused by poor construction technique, poor design or poor workmanship.

     

    • If moisture is getting into the masonry wall eliminate source of moisture.
    • If moisture is migrating through the wall from the outside (e.g., basement wall), apply waterproofing to outside of wall.

    Remove all efflorescence and loose flaking, chalking paint with a wire brush, scraping or power washing before repainting.

Chalking looks like a chalky powder over the exterior paint.

    • Cheaper-quality of exterior paint was used, containing high levels of pigment extenders.
    • Interior paint used in an exterior setting.
    • The paint was over-thinned before it was applied.
    • Porous surfaces were not properly sealed before painting.
    • The surface must be properly cleaned before applying a coat.
    • Always refer information sheet and comply it strictly or applying the technique mentioned therein.
    • Mix the paint properly while colouring pigment is added.
    • Use weather-resistant paint for areas exposed to weather or UV light.
    • Make sure that the paint is not contaminated with foreign materials.
    • Remove any unstable paint films.
    • Don’t use an interior paint for an outdoor
    • Chalking is considered dirt and must be removed before repainting.
    • Remove chalk by washing or power washing the surface with an appropriate cleaner. If a proper cleaner is not available, rub the surface with wire brush or sanding to remove the excess surface powder. Then wash the surface with high pressure of water.
    • Let dry the surface and use latex primer as the first coat of paint. Repaint the surface with the good quality paint.