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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.