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Windows use butyl tape to seal the outside of the window unit to side, usually 3/4 " wide × 1/8" thick. Could be white, tan, or black. The very outside edge where squeeze out occurred could be dry and cracked, but I seriously doubt the rest of it is dry. I would use a plastic tool to clean the outer edge all around, then silicone chaulk it.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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