PAINT PROBLEMS
Efflorescence
Efflorescence is the white, powdery, or crystalline deposit that forms on the surface of masonry, concrete, or other building materials. It occurs when water-soluble salts in the material are brought to the surface by water, where they evaporate and leave behind these deposits.
Common in areas with high humidity or water exposure, often appearing on basement walls, concrete floors, or outdoor masonry. Indicates either moisture issues in the structure that might need to be addressed to prevent further damage.
Soluble alkaline salts draw from mortar, sand and brick to the surface crystallise to form a deposit. The deposit can take the shape of a either a thin hard film or profuse fluffy growth
PROBLEM
- Points to humidity or structural water issues that need to be addressed
- Painting should be avoided until problem is solved, as will result in discolouration, non drying or even paint film failure
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
Fungal Growth
Algae, moss, lichen and mould that is visible as a black, brownish or green growth typically found in dark, damp corners.
PROBLEM
- 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 (or similar detergent), using liberally. Do not rinse immediately
- Leave for 48 hours and then wash down walls with water.
- Repeat till 100% removal
Saponification
Saponification is a chemical reaction involving hydrolysis (breaking down by water) of esters under highly alkali conditions to form alcohol and the salt of a fatty acid. Building materials such as brickwork, cement and mortar are initially very alkali and when combined with water, result in an environment that attacks solvent-based paints that are applied too early.
RISK
- Oil-based paints are softened and liquefied by highly alkaline moist surfaces, resulting in complete application failure
TREATMENT
- There is no way to stop the saponification process once it invades your wall. The only thing left to do now is to strip and scrape all the paint film off the wall using your most trusted scraper. Clean the surface thoroughly and wash off the remnants. Where applicable, use a high-pressure washer to easily remove the paint and dirt. Sit back and wait for the surface to dry.
- Leave for 48 hours and then wash down walls with water.