If you can get in there. I've used Quick Steel to repair an alloy sump, a hole about 1/2 inch square with great sucess., The usual Plastic Padding was usless, wouldn't go off with the oil. The Quick Steel is easy to use, just breack off a lump and rub till coulor changes, will also go off underwater, with oil and other contamination. Comma Frost bite is good stuff for that situation. Spray just the drain cock.