[jmk]

I have the same year so I'm interested in how this turns out. Ultimately a careful chisel will remove any wood, but it's a lot of work. I suspect that may be your only option, however. You might test "Goof off" (Xylene) on the adhesive. Works on lots of things and I can say from experience the gelcoat appears impervious to it. I've thought that if I ever did this job I'd replace the single teak board with 2" wide battens. Those boats were built in a day when teak was much cheaper than today. Now, battens are much more easily obtained than a 6-8" wide board 1/2" thick and probably 6" long or more. Don Casey's information webpage on caulks is good reading as to what you can put against gelcoat. I noticed Tiara specifically changed from that hard black rubber to black silicone for all joints that contacted the gelcoat. This would be consistent with Don's guidelines.