Make sure you get as much rust off as possible if you can sand blast the spot its the best but if not using a rust wheel on a drill will usually do the trick otherwise it will be back in 6 months.

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When we drink, we get drunk
When we get drunk, we fall asleep
When we fall asleep, we commit no sin
When we commit no sin, we go to heaven
So Lets all get drunk and go to Heaven.