I used fiberglass Bondo this summer on my pump. The same stuff they make for boats. I actually used it before on my crotch rocket plastic. It's held up for 3 months, and just started leaking last week.
I just got my new Pentair Whisperflo in the mail today So I will refiberglass this one and retire it to the garage for when I need to drain my pool. It'll work, but how long is the ??