I could be wrong on autozone carrying it

I did buy mine at checkers but the package looks exactly this one -

It's a urethane epoxy filler, it's two chemicals that you combine manually. Real simple stuff. I wish I took a good before photo of my bumper here's a before and after look -
You can see here just how bad the front bumper was, and just look at that split in the middle

And the after shots could have been better

, I'll have to take some updated ones
