I had worked in one new and used car dealership htat used Seallall which we purchased at Abuchon Hardware stores here in New England. You could put the car up on the lift, tank leaking , take what we call an acid brush (stiff small heavy hair paint brush) brush it on the dripping leaking tank. Waited 10 to 20 minutes, put on another coat , wait , another coat and next day the car was driven to an auction 250 miles away. Stuff works good!