How to join plastic fairing?

I have a Honda hornet 600. The top rear fairing is 3 pieces that I would like to join together into one seamless piece as well as filling in the seatlock keyhole. I'm uncertain as to what material to use. I would think that traditional body filler would be too brittle. It is plastic so it does flex a little. Any ideas?

You can get a plastic welding kit. That should work fine.

Silicon caulk like you put around a bathtub. It's flexible and paintable.

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