I first tried to reinforce the canopy from behind, by spreading a thin layer of plastic glue over the crack, to try and bridge the two sides together.

That worked, but.... it also melted that very, very thin styrene, making the problem worse.

Still, the problem was localized to one black panel, and wasn't yet spreading much into the gray sections of the panel.

So, I guided the melted styrene inward a tad, to be below the surface of the surrounding area.

Once the glue dried and was firmed up, I sanded off the black, put some plastic filler into the area and sanded it smooth. That filler also was dangerous to the plastic so I went with thin coats so it would dry very quickly.

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