Moto64 wrote:
Going to look sweet when you are done. Spot shrinking with a torch does a lot for oil-canning. You don't really want it doing that with filler on but I am sure you got it close enough to be good.
I usually use an attachment for a MIG welder, a torch or shrinking disc. The stud gun will also spot shrink without welding a stud. It always adds a little shrink when welding on a stud and sometimes that's enough. Shrinking isn't always the solution to an oil can. It depends on what caused it.
In this case, I needed to stretch out a low spot that I couldn't back up with a dolly. I got it close enough to stop the oil canning but couldn't completely remove the low spot. Many more hours might have gotten it a little closer and required a little less filler, but there is always the risk of creating another problem.