I also repaired my crack with 5-minute epoxy glue. I used duct tape for extra security on the back of the bumper, where it cannot be seen. I sanded down the bumpy areas after the glue dried and repainted the damaged section of my bumper with six layers of base coat and four layers of clear coat.
I am quite disappointed at how flimsy our bumpers are. Props to Subaru for making a great engine, but thumbs down on the cheap plastics.