Dave
Did not use any sealant on the seams. The alum sheets have a two inch overlap and with the rivets on 4" centers they are pretty tight. The cast alum. corner caps are sealed with silicone and attached with screws. The alum top trim is sealed with self leveling silicone roof sealer purchased at a local RV dealer.
I just returned from a 2 week vacation in southern AZ/Cal area where it was a pleasant 80-85 degrees. This morning it is 4 degrees with 3" of new snow and ice.....should have stayed another 2 weeks!
MMM
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