I've replaced the keel guard on my last two boats, and it takes some time and quite a bit of elbow grease, but can be done. I did the first one around six years ago, and it was still in good shape when I sold the boat last month. The second one, I finished last early this spring. The adhesive on the keel guard is kind of like a thin double sided tape. What I've found works well is to peel the keel guard off and use a heat gun to heat the double sided foam type adhesive and scrape it off with a putty knife (carefully) about a foot at a time. When you are done with this process, you will still have the sticky adhesive from the other side of the double sided tape on the boat hull. I put acetone in a spray bottle and spray a couple of coats of acetone on the adhesive, again about a foot at a time and scrape the adhesive off (carefully) with a putty knife. I then soak a towel with a product called goo gone to remove the last of the adhesive. The process takes several hours, laying on your back under the boat. A new keel guard can be purchased at many fishing outlets, I bought mine at Cabelas. Installation of the new keel guard is pretty straight forward, just follow the manufacturers recommendations.