Quote: I did not know using bondo was a sin? If the hole is deep enough with enough contours and you think it will stay in there then good. Go with your gut feeling. You treated the metal down in the hole so it should not rust anymore (theoretically).
I don't think rust would be the problem. If bondo is simply used to plug a hole of any size, without something for it to hold on to besides the circumfrence of the hole, is not matter of IF it will hold; it will eventually break out. Unless of course you put some newspaper or rags behind it
