Any of the quality two-part epoxies will work. Stop-drill the crack as RC directed, rough with 80 grit sandpaper, and clean the area lightly but thoroughly with a non-residue solvent i.e. toluol, acetone, or MEK.
Devcon, JB Weld would both work fine, or 3M Structural 2-part Adhesive if you can find it. I buy 3M products when I can, even in tape. Their products do exactly what they say they will do.
Do not try to speed cure or use prior to full cure, and it will outlast you.
