Stucco

Previously Painted/Flaking or Peeling/With Elastomeric

a. Surface Preparation:

NOTE‚ If lead is suspected in the paint, do not attempt to scrape, sand, power wash, use heat gun, etc., which might put lead into the environment, but rather contact a contractor qualified for lead assessment and abatement

• remove all loose or poorly adhering paint by scraping, or by hand wire brushing using a stiff metal wire brush; wear eye protection, work gloves and a dust mask; or power wash with plain water, taking care to not drive water into cracks or porous areas
  
• 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, residual particles of paint, 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:

• after preparing the surface, apply exterior latex primer
  
• be sure any sources of moisture behind the substrate are eliminated
  
• do not use elastomeric coating over old oil-based paint
  
• use quality exterior latex primer that is recommended for masonry surfaces
  
• 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.