Efflorescence and mottling
Efflorescence is the crusty, white salt deposits, leached from mortar or masonry as water passes through it.
Efflorescence is the crusty, white salt deposits, leached from mortar or masonry as water passes through it.
Failure to adequately prepare surface by removing all previous efflorescence
Excess moisture escaping through the exterior masonry walls from the inside
Identify and rectify the source of excess moisture, consider installing vents of exhaust fans where practical (particularly in kitchen, bathroom or laundry areas).
Remove the efflorescence and all loose material with a wire brush, power brush or power washer; then thoroughly rinse the surface.
Apply a quality water-based or solvent-based masonry sealer and allow it to dry completely; then apply a coat of top quality exterior house paint, masonry paint or elastomeric wall coating. Dulux recommends the use of Weathershield® Matt for exterior surfaces.
Have you noticed small droplets appearing on your fresh coat of acrylic paint? Don't panic – it’s a normal part of the curing process. Find out more.
Yellowing describes the development of a yellow cast in ageing paint solvent-based enamels.
Wrinkling is a term to describe a rough, crinkled paint surface, which occurs when uncured paint forms a 'skin'.
Tannin staining is the brownish or tan discoloration on a painted surface due to migration of tannins from the substrate through the paint film.
