I had my last boat for eight years, I have had my present boat for 5 years. Both boats had/have bimini tops with zippers for windows and full enclosures. We also have owned a car with a convertible top, that we bought new in 1998 and passed on to one of the kids. All three of these fabric tops were treated with plain ole silicone spray. When I sold the eight year old boat, the top was in perfect condition, so is the present boat and car. You can waste your money on all kinds of other stuff, but , I can tell you from experience nothing works as well as silicone. ************************************** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour