Uh....I once used JB Weld to patch a quarter sized hole in the oil pan of my friends eclipse. Worked great for years and still did when he sold the car. I drained his oil, dropped the pan, degreased it and cleaned the hole really well. I mixed up the JB Weld, put it on and let it dry for a couple hours then i put on one more layer and let it dry inside for a day. I put it back on the car, and added oil. Presto Changeo it worked just fine.
Kyle