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If ABS, I have learned the following from printing 3D models in ABS. Acetone used in very small amounts will marginally melt adjacent surfaces (like a crack) and result in a surface bond. You might brush it on the crack from the inside of the fairing with a model brush. I mean a very small volume. Capillary action will draw it into the crack and create the bond. Hold it for a few minutes. My understanding is that the acetone melts the 2 halves so they can bond, and then evaporates. You might want to follow up with a lap of fiberglass or epoxy on the inside for reinforcement. May be worth trying. Please try first in a small inconspicuous place.Matt