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depends on what you use... Ureatheane sealants will you 2-10 years depending on exposure. Latex will get you 6 months to 2 years, painting it will help in both uretheanes and Latex. A "Good" Nutural cure silicone will last 10-50 years. Dollar for dollar Dow Corning contractors weather proofing sealant will be the best. Performance wise i would say Dow Corning 790... Check on the SWRI web site you will see both products highly rated.

Also, the sills should be sloped away from the building atleast 5 degrees... If someone put sills installed sloping towards a building they should exiled from contruction.
 
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