Disclaimer: I am new to airstreams, and have exactly 0 experience with older airstream finishes.
Now that's out of the way I'd say one of two things:
1. That there was clearcoat still there and the mothers cut the clear coat. Easy solution is a finer polish to remove the haze. From what I understand about older airstream clearcoats, this is the less likely option.
2. Too much mothers was used too fast. Take a smaller amount and work a smaller area and see if you can bring up a shine.
Now another option would be to find a good fine grade polish and try a small area and see if you can remove the haze- try by hand first, and if you can then switch to the buffer so you can move a little faster. At least that's what I'd say if this were a car finish.