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For sills with surface cracking, some of the newer paints on the market hold considerable promise because of their durability; these are usually preferable to metal panning, which can hide ongoing deterioration and tends to promote decay over the long term, since tight permanently sealed joints are difficult to achieve. Epoxy consolidants and fillers may also be used where more extensive sill deterioration occurs. This is a cost-effective alternative to total sill replacement. Epoxy can be used to recondition the bottom of sash frames at the sill junction, although splicing-in new treated wood is another acceptable option.

Fisher, Chuck. Rehabilitating Windows in Historic Buildings: An Overview (GSA 08500-03), Historic Preservation Technical Procedures, U.S. General Services Administration


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