I dremmeled out the dry laminate found underneath the fiberglass rudder tube using a flap wheel attachment. In very localized spots there was some discoloration of the laminate which indicated to me that water had penetrated. I took a fine grinding attchment and drilled out these area like a dentist. Once all of the discolored areas were removed it was ready for a gooping of thickened epoxy.


You can see the areas that were dark after grinding with the dremel. I forgot to take a picture after I drilled out these areas.