The area of where the petcock is on the radiator has broken off and left a hole in the plastic area how can I fix that if the JB radiator and Real Steele doesn't set and it still leaks

What is your question?

It has a hole of the size of a dime on the plastic part of the bottom where the petcock is on the radiator. The petcock broke off. it left a hole the size of a dime on it. Done used the Real Steele stuff and it doesn't stick to the plastic. So what do I do now

What makes this problem better or worse?

Having no type of supplies to fix the problem with

How long has your 2009 Chevrolet Cobalt had this problem?

A week and a half