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I have done about 20 rudders with evostik, it seems to last for a year or two - I check them each winter and reglue if necessary (I use quite firm neoprene gasket material rather than rubber. On a few I have had to use a double layer to get it so the blade does not move fore/aft but latches in nicely.
Do glue it on so that the rubber is a little proud of the bottom of the A frame - it is the bottom metal edge that does the damage to the blade.