I have the above named 1968 JD 420W that my grandpa restored before he died. It means a great deal to me. I put some gas in it that was stabilized with Sta-bil (which I haven't done before), and plowed my driveway about 5 days ago. I came out to my barn today and the gas tank was leaking from somewhere I couldn't see, but it was on the bottom of the tank. It ruined a good deal of paint . It looked like there was some kind of epoxy on the bottom of the tank, on the exterior. I drained and pulled the tank.The inside of it looks white. I assume this is some sort of sealer, but I'm not sure. How can I clean this stuff out of the tank and apply a new sealer to keep it from leaking? Should I try to clean the epoxy stuff off the bottom of the tank? Should I just involve a professional shop? Thanks for any help you guys can provide.