Acrylic latex caulks with a small amount of silicone in them will
provide good adhesion and elasticity, are easy to use and clean
up, and have excellent weathering capabilities. They are primarily
used for interior and exterior painting to prevent moisture from
entering surfaces and causing decay, sealing drafts to help
enhance insulation, and to help provide a good looking finish.
Before caulk is applied, all surfaces should be free of dirt,
mildew, water, and any other substances that would interfere with
the overall adhesion of the caulk. Most caulks can be applied in
40 degree temperatures and up. When applying caulk in lower
temperatures, always stay ahead of the Sun. This will allow the
Sun to come around and begin to dry the caulk before nightfall,
when temperatures drop to their lowest. If caulk has to be applied
in a shady area, then the caulking should be done shortly before
peak temperatures of the day, allowing 2 to 2 1/2 hours to setup.
Complete curing time is 2 to 10 days, but can usually be painted
within hours. True silicone caulks are not recommended for areas
being considered for painting because they are not paintable.
A solvent based "roofing tar" type caulk and the true silicone
caulks are excellent for sealing leaks. For emergency leaks, use a
specially formulated caulk that can be applied during wet weather.
However, once weather conditions improve, the solvent based
"roofing tar" caulk or the true silicone caulk should be reapplied
for longer lasting protection. Solvent based caulks intended for
use as a substitute for acrylic latex caulks should be avoided
because they become hard and brittle. Always remember to check
caulked areas annually, especially where leaks have been repaired.
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