I spent an hour removing the dorsal fin from the fuselage ... the fibreglass had a greater affinity for waxed electrical tape than I expected! I had to use turps to weaken the bond between the tape and the fuselage in some places, but it came off after prolonged encouragement. When that was done I cleaned it up, removed the mold parts, die ground out the excess resin and filler and rough trimmed to shape.