Use Gel Super glue from dollar store with JB weld from Home Depot.
Glue on plug->>>>small ball of JB weld—->glue on JB weld and then press in place for 30 secs + rock gently
Will never come off!
Bob smith industries glue tends to be my go to. However I've yet to come across a glue with a fast setting. Plan on holding the frag in place til it hardens. Takes a minute or two.