I have an '87 BMW 325is. It was my dad's car. He passed away in 2000. Last year the washer reservoir started leaking. I finally looked at it and it is cracked on the bottom where a plastic bracket is welded on. What is the best way to seal something like that? Since it will always have exposure to fluid I don't think regular gasket sealers or silicones will work. Epoxies?