What make and model of air conditioners do you have? None use "sealant" that I know of and all use a foam gasket instead. If you have Atwood roof units as we do:
Remove the inside panel with the filter and the other one with the dump vents. You'll see four bolts, one in each corner. Ours on our Atwood AC-1511 units are 11/16" but others have reported different bolt head sizes.
Those four bolts should be checked for tightness once a year as they will loosen up. There is a foam gasket on the roof between the roof and the roof unit. That foam gasket needs to be partially compressed.
If those bolts are loose then water will get inside the motorhome. Some people have posted videos of it literally raining inside from the air conditioner when those bolts are loose. If the bolts are cranked down tight then the foam gasket will be squashed and water will get inside the motorhome.
But Atwood did not leave enough room in the thin plastic frame screwed to the ceiling on ours to be able to place a socket directly on the bolt heads.
If you have that bolt head access problem, remove the screws holding the plastic frame to the ceiling and use a file to enlarge the holes so you can place a socket on each bolt head without needing to remove the frame in the future. Then screw the panel back to the ceiling.
Those four bolts should be torqued to 4.4 ft lbs (four point four, not forty four). That's not super tight, just snugged up.
4.4 ft lbs is not much torque. I just put a socket on each bolt and tighten them until they feel snug. DO NOT fully tighten them.
Hope this helps.
Ray
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2020 Georgetown GT5 34H5
2020 Equinox Premier AWD 2.0L/9-speed
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