Paint Chalking

Definition:
Paint chalking is when there is a formation of fine powder usually white (similar to blackboard chalk) on the paint surface caused by weathering on the paint surface.

 

Causes:
• The surface of the painted wall is exposed to sunlight and damp conditions over a long period of time.
• Use of low quality wall paints.
• Paint applied is thinner than it should be.
• Base paint not used or low quality base paint was applied to surface.

 

Solutions:
• Clean the calcified surface by scraping, sanding, or scrubbing. Make sure that the entire calcified surface has been peeled off and then clean off.
• Use water to wash out any loose calcification. If there is any residual oil, use detergent.
• Wait until dry or use a drying cloth to speed up the drying process.
• If the calcified area is small and the previous paint coating is still in good condition, then after cleaning there is no need to apply a base paint.
• If the surface is only slightly calcified and the existing paint coating or primer is still intact, after cleaning, use Mowilex Wall Sealer WB or Mowilex Wall Sealer SB.
• If there is heavy calcification in the concerned area and it is peeled to the skim coating, then use Mowilex Undercoat Cat Tembok first before applying Interior or Exterior wall paint.