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Sashco Log Jam is a flexible chinking that seals the joints between logs and stretches as the logs move. It's easy to apply if you get three things right: a bond breaker behind it, the right thickness, and good tooling. Here's how to do it, based on Sashco's own Log Jam instructions. What You'll Need Log Jam chinking in cartridges or pailsBacker rod (or Grip Strip or clear packing tape) as a bond breakerA caulk gun or bulk loaderA damp foam brush, plus a putty knife for square logsA spray bottle …