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Makes me want to scream!!!!!!!!!!!!!!!
No you can't use Great Stuff foam as it is open cell and will absorb water.
You can buy closed cell foam liquid to pour into the rudder, but usually you can buy it only in gallon sizes...and it isn't cheap.
You could TRY to make a female hole in the rudder area, the make a male piece to fit it using foam from HD or Lowes. Then glass over the area AFTER removing all the bottom paint.
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