Brand new Class C owner and RVer

Actually the leaks are fixed. There was one in the front right corner of the cab over (the one that ruined the bed area). I patched that and put self leveling stuff on it. The side wall is fine. I found all my leaks by sealing all the windows, vents and drains and setting a fog machine inside. Then I pumped air in with a compressor through the water mains inlet. I opened the bypass cap. The positive pressure made the fog come out the leaks. One around the antenna and one the good one in the front. A little one at the back window which I need to caulk. The rubber seals around the window have shrunk exposing one corner. I don't know if I will replace it or just caulk it with black outdoor goo.