Update: 11/22/2014
Since winter is approaching california and I have a couple days off this week, I decided to tackle my rusty quarter panel and get it protected from the rain.
If you look back in the thread, you can see I replaced a giant section above the wheel well, but I still had these 4 holes that looked like someone mounted an antenna there previously.
I don't have a picture, but I simply used a hole saw to cut the hole section out and then trimmed up a round patch to fit inside.
Here's the first with a couple tacks. The crease near the bottom is from my larger patch of the wheel well.
And adding more tacks to help avoid warping.
In reality, it did warp a lot. But since I had access to the back side, I simply kept pushing it out to keep it level every few tacks while it was hot.
And here's the full circle. I need to turn down the wire speed some more. I'm out of practice.
And a further back shot.
And after some flap wheeling
After the welds were flattened, I took a measurement with a straight edge to see where the body hammers needed to land.
If you can see the daylight under the edge, it's about 1/16"-1/8" too low right around the patch. This is pretty normal amount of shrink after that much heat has hit the area.
Here's a shot mid-way through the process of using different hammers, pry bars, and a torch to push the metal out. The torch helps the metal move a bit easier and even shrinks some small spots when needed.
Getting better
And better, in fact it's pretty good and about as good as my skillset is capable of.
Farther back shot after wire wheeling the torch marks off.
So far, it's fairly smooth, but has some light dimples from the tools on the back side.
Along the fender shot. It should require very little filler. Probably just glaze it.
As a kind of sanity check, I put some primer down so I could block sand it out a bit and check any high spots that needed to be tapped down.
I'll post up a few more of the finished panel tomorrow. Ran out of daylight after that one.