So I finally finish removing all the paint and priming the interior of my 240Z and decide to start on the exterior. From the roof working my way down. The first thing I notice is that the aircraft paint remover is not working nearly as well on the exterior paint. I chock it up to what I thought was really thick primer used on the roof.
But wait, that's not primer - that's body filler.
But it can't be, I think to myself. I just did the inside roof of my car down to bare metal and there were no indentations, creases, etc. For all intents and purposes, it is a perfectly straight Cali car.
So I spent about 2 hours with a dye grinder, praying the entire time not to find body damage, rust, or Jimmy Hoffa's corpse. I am pleasantly surprised to find the extent of the damage consists of some pinprick corrosion holes - that's it.
So now we come to my question (and the title of this thread):
Why did someone fill my rather straight roof?