cracked knee, how should I fix it?

On my last trooping I cracked my Jango knee. My fiberglass knees are not in yet and don't know when they will be. What should I use to fix them? I know some glues get brittle when they get hard so I am not sure what to use.

Thanks,
Asok

Hey asok, i know you bought my jango along time ago so dont know if they are mine or not, but on the first set i had they had a crack in them from ra, but i used 5min epoxy, and let it sit for bout 4 mins, then put it on from behind the crack right before it started to harden and squeezed the armor together so it was flush again, and then held it till it was hard, worked perfect.

My knees crack everytime i wear them. I repair the cracks with hot glue believe it or not.