Dura Glas then epoxy
Keep in mind I am not a professional, but what is polyester filler, can you mention name brands, by the way you made a comment on one of these sites that anybody could restore a car, that there is a big difference in professional collision work and restoration work, and amateurs should feel comfortable about doing restoration work.
Well you made my day and probably quite a few others, when your out in your garage doing this work you don't have another body type guy to ask does this look okay.
It's comforting to hear a top professional like yourself say that, I'll walk in the house and instead of second guessing myself I just stop and think, amateurs can do a good job, then I feel a lot better.
Thanks again Brian