Why 1/2 *** the process? I mean if you have one or two holes, I can understand, but if you start digging and realize like I did that the rear fender wells are like swiss cheese with dozens of small, medium and large holes, I suggest going to
and ordering the factory OEM thickness panels. It came out great and will hold up much longer than a patch where you may or may not get all the rust.
Consider it...they aren't expensive.
Here's a before shot with the panels about to get welded on:
And here is what it looks like today...