Exterior/Stucco/Relatively New and Unpainted/To Be Painted/With Elastomeric

a. Surface Preparation:

  • if efflorescence is present, remove by hand wire brushing; wear eye protection and gloves; try to identify and eliminate any source of water from behind the stucco that could have caused the efflorescence
  • scrape out and widen any cracks; brush out dust, and seal with 100% acrylic or siliconized acrylic caulk; make second application in several hours if needed; wall and chimney caps must be sound and continuous; chimney flue should have rain cover
  • treat any mildew with a 3:1 water:household bleach mixture, leaving it on for 20 minutes and adding more as it dries; wear eye and skin protection; rinse thoroughly
  • remove dirt, chalk, dust, unbound sand, treated mildew, etc. by scrubbing with detergent and water, and rinse thoroughly; or power wash with plain water, taking care to not drive water into cracks or porous areas

 

b. Priming:

  • priming is necessary to ensure maximum durability and resistance to efflorescence, alkalinity and mildew
  • use quality exterior latex primer that is recommended for masonry or stucco
  • do not leave a primer unpainted

c. Painting:

  • use top quality exterior 100% acrylic elastomeric wall coating
  • apply two coats for maximum crack bridging and durability
  • apply at manufacturer’s recommended spread rate; for best performance, this will be 40 – 60 sq.ft./gallon to achieve a minimum dry film thickness of 7 mils per coat.
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