as above, definately epoxy. if the chassis has started to delaminate (split) then run some thin cyano down the split then rebuild with epoxy. get a strip of lexan or similar plastic, apply a little vaseline or similar to stop it getting stuck and tape it upright around the front edge securely, you can then fill the damaged area tidily. i put tiny offcuts of raw carbon matting in with the epoxy mix when i do it, makes it all look a little prettier, but thats only because i always have little bits hanging around from one project or another
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