Father-Son 1974 Duster Project

I stopped by the shop this morning and they had Misty outside. No progress this week due to the short week.
Along the way, I have heard a few people say not to take out the old seam filler behind the drip rail. It's cracked and not in good condition. I skimmed it with new urethane seam filler, but noticed today that it looks pretty shakey. The rest of what we've done is so good, that old crap needs to come out.
My deal with the paint shop is for 2K primer and paint so I'm on my own on replacing the filler. Any advice on a how to?

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