Stucco
Previously
Painted/Sound & Continuous/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
- 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
- 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
- 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
- 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:
- priming
is helpful but not necessary if existing paint is latex in excellent
condition, unless specified by the elastomeric coating manufacturer
- be
sure any sources of moisture behind the substrate are eliminated
-
prime if there is any sign of efflorescence (remove it first)
or any loose paint (remove by wire brushing)
- use
quality exterior latex primer that is recommended for masonry
surfaces
- do
not use elastomeric coating over old oil-based paint
- do
not leave a primer unpainted
c.
Painting:
- use
top quality exterior 100% acrylic elastomeric wall coating
- apply
two coats (or one coat if old coating is an elastomeric also,
and is in good condition)
- á
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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