A friend gave me an old kayak. It is not a whitewater boat but that is how he used it. For the last 40 years it has been in his attic and the abuse and neglect shows. I like its lines, I like the way it paddles, it is only 30 pounds and I want to use the knowledge I gained building my Chesapeake 16 to make it beautiful again.  It is not a wooden boat, it is a composite, plastic/nylon/fiberglass. I believe I have a good restoration plan but he did put a silicon glob on each end of the kayak to act as bumper. I have almost all of the silicon removed, my question is how do I get the remaining thin layer of silicon off the deck and hull. It is a small area, the deck and hull come to a point at each end and the silicon covers about 1.5 inches on each end but I need to get if off so I can reinforce each end with a fiberglass patch. Any ideas?  Thanks. In case you are wondering it was made by Phoenix Products and is a Mendesta. The company's current website is http://www.pokeboat.com/index.html   Mike