Surface
Preparation
If mildew is already present on a substrate, the mildew
but be killed and removed before the substrate is finished,
or else the mildew will grow through the new coating.
To kill mildew and remove mildew from the surface, follow
the steps outlined below:
1. Using a spray canister(one designed for
insecticide application will do) available at
most hardware stores, apply the following solution
liberally to the substrate and allow to set
for about 10-15 minutes:
a. 3 quarts water
b. One quart common household bleach
c. 1/4 cup maximum of liquid dishwasher detergent
(ammonia-free)
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The bleach is the key component that actually kills the mildew.
Allowing this solution to set for five minutes give the bleach
time to settle into any crevices and hard to reach place to
kill all the mildew present. Skipping this 10-15 minute set
time may result in an inadequate job. The detergent is added
in a small amount to help emulsify any mildew or dirt to aid
in its removal. Liquid dishwasher detergent is the best choice
it will not foam like regular dish or laundry detergent.
2. Using the same solution, wash the substrate clean using
a power washer. A Second choice if a power washer is unavailable
is to scrub the surface with the same solution. Far masonry
substrates use a wire brush. For wood, use a softer bristle
brush. And for substrates sensitive to abrasive damage like
aluminium and vinyl siding, use a sponge.
If mildew was present on the original substrate or previous
coats, and a new finish coat is already applied, the mildew
will grow through the coating. It is usually impossible to
stop mildew growth at this point. All the coatings must be
stripped down to the original substrate and then cleaned as
described above before applied a new coat. (7)
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