Hmm, I didn't think of galvanic corrosion. I actually have two patch on there you can't see in aluminum, they worked quite well for about 10 years. I may remove the new ones and just go the filler route, which isn't good either. This car's life and value is very limited. I make the paint look great, it turns into a $2000 car. Basically it is an experiment to see if I can make this car look passable and improve on the final job for the 70S when I do it.