My sister's '97 Honda Civic has a leaky trunk, when it rains the water gets into the trunk. No accident but I'm thinking the rubber seal is perhaps old and not sealing properly. The car is stored outside and in snowy/icy winters. I was wondering if there is any product she could try to help restore the rubber seal? I know that some of the Kayak mfgrs who use rubber gaskets to seal hatches suggest something called 303 protectant. I think I use a product for my convertible top on my MR2, but was wondering if there is anything that she could buy in a local auto/hardware store that is similar. Jay P.S. I'd try Silica but I would like to save it for a rainy day.