Any good caulk will work. I buy DAP painters caulk by the case. It cures
quickly and is paintable in about 30 minutes.
Make sure the caulk says it's paintable and is designed for outdoor use,
preferably on siding.
I'd have to disagree with this one. While latex caulks are user
friendly, they will not remain flexible nearly as long as a good
urethane caulk. I'd use OSI quad. (http://www.osiproseries.com /
Category.aspx?CategoryID=Window-Siding-Sealants). Superior adhesion,
superior flexibility when compared to latex.
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