I have a haulmark elite 2 with the fiberglass/plastics cap on the top of the front I huess to help with the aero of it. Anyways I opened the trailer up for the first time in a few months and I had water streaks down the front and the floor had a little water standing looks to be coming from around that cap. What is the best thing to re-seal the roof of a trailer? It is a 2000 model and has never been re-done that I can tell. thanks