As John said, locate and repair the source of the leak, liquid roof is not a stop-leak. I recommend locating an RV service center that uses the
Leak-Tech system. After we took delivery of our new 5er we noticed a water leak in the RR corner dripping onto the carpet. We returned to the dealer, who used the Leak-Tech system to locate the source of the leak. The tech located the source about 14' from where it was seen in the RV. He continued, and also located 2 other small leaks that were as yet undiscovered. He sealed the 3 sources and we have never had a leak since.