Calking around air conditioner shroud on roof
I have a small 16ft trailer, with a small side mounted air. On the roof is your typical air mounted plastic cover. I see four small round areas that have lap sealant on top of the screws (I think) ...
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If the OP has a wall mounted AC, the plastic shroud is probably a vent. Just caulk around the outside edge of the vent. You don't need to pull it apart.
