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Fixing cracked side panels

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Bryanj:
Tape will allow either side of the crank to flex independantly so it will propogate.
First answer was very true in that by the time they crank the "plastic" has already gotten very brittle and shatters easily

K2-K6:
Very thin woven cloth (glass fibre weave) are available for this repair type application.

Unsure what the original plastic is though.

You can carefully test a tiny patch on rear with different solvent to see what makes it sticky to help research.

I've repaired some things like this with cotton scrim (well wash T-shirt) and epoxy resin to adhere it. Dont get caught by the owner of T-shirt though!  Cut a patch only out of the back so they don't notice when wearing  ;D

Repaired a car front valance recently with proprietary resin and their supplied patch. Surprisingly secure and workable (the black apron down underneath the bumper) against my initially cautious expectation. 

Spitfire:
On my 750F1 I used a fibre Glass repair kit in the inside of the panel and on the outside I used CA to fill the crack and sanded it smooth.
The trick with the latter is not to leave the CA too long as it gets really hard, use an accelerator and leave it for about 20 minutes before sanding.

Cheers

Dennis

Grewth:
Thanks for the advice everyone  !
Woven glassfibre matting and epoxy resin it is then.
I'm only doing it to preserve the original paint on the panels, they'll last as long as they last, and when they finally fall apart,  they'll be binned.
I've already got a set of the LPM panels,  and very well made they are,  although polypropylene is supposed to be a pig to get paint to stick to.
They still sell on ebay

Spitfire:
I had no problem painting my LPM panels, I used Halfords rattle cans for mine, undercoated with Halfords plastic primer, 2 coats of Ford Graphite Grey, one coat of clear. The Ford colour matched the original Honda colour.

While I was at it I did some spares just in case.


Cheers

Dennis

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