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please do not use panel bond as a filler. it is not a filler. Panel bond will make the paint swell, and over time will look just as bad as it does right now.
So I looked through the photos in that album, and without being there to really give a good look at it, it looks like the metal has oil-caned, not just because it was a flat piece of metal, but it sunk down as you were welding it, a result of welding it in too fast. You'll know if its oil caned if you hit the panel up with a body hammer, it'll pop up with a "thunk" sound, and then you'll have an odd high spot. Basically the metal is stretched, and theres too much metal for the space it's in.
There's a few things you can do...
option 1, shrink the metal. You can look this up on youtube and such, you don't NEED a torch to do it on such thin metal, MAP gas will work just fine. This takes some skill and practice to learn where to heat it up and shrink it.
option 2, pave it over with fiberglass. Not the way to do it. I'm not sure what your ambitions are with this car, but the roof is pretty well dickered and you're not a bodyman. If your going this route (which again, isnt the best), use old fashioned USC Duraglas. The long haired stuff is just going to cause a big mess, leave too large of air pockets that will cause problems later when the roof gets hot. Make sure to prep the roof with 36 grit to get hood adhesion. Once you get it pretty close with the fiberglass, then you can switch to a normal polyester filler, and then finally a finish glaze.
option 3, pay someone else to do it. Find a bodyman who wants to do some sidework, and show him whats up. To fix that will take some time, but it can be done.
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