Once upon a time, there was a fiber-filled catalyzed product that was made to make body repairs on Corvettes and fiberglass-hulled boats called Tiger Hair. It would be ideal to repair the cracks and splits in the fiberglass interior end caps. It worked better than fiberglass mat, was easier to apply, and easier to form with sanding tools. It (or a modern equivalent) should be readily available from automotive body repair supply outlets.
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.