Log Jam ChinkingOld mortar cracks and crumbles out of the joints, allowing in wind, bugs, dust, rain and pollen. That is why Sashco created Log Jam, the industry standard for synthetic chinking. Its texture recreates that old time mortar look while sealing your rustic cabin from vermin and wind alike. It stretches and will not let go when your logs move. With Log Jam, you can keep the cozy feel and rustic look without compromise. Ultra flexible and elastic will not