Pre 2000's bike bodywork.

I've seen it with my XRV, I've seen it with my VFR, the bodywork/fairings are starting to fall apart. Both are 23yrs old and the plastics are giving up the ghost. Patching is just that, patching. But there is always a new crack developing somewhere.
What options are there? I'm assuming replacement 2nd-hand are just as old so I would face the same issues in short order.

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