Exactly. You paid extra for the vinyl top, and then they gyped you by not leading the seam!

I think the factory original filler used is the same stuff used on the roof drip rails.
I think I'll put lead back, since the seam was visible through the original vinyl top before I removed it. I've never worked with lead before, but I'll see what Eastwood has.....thanks Patronus!
I have attached a modified photo, that shows the location of the seam, and the yellow dots show the typical extent of the flexible body filler, since it's difficult to see in the photo. I'll try to find some pictures of the car when I got it 22 years ago. I think the seam was visible in the pictures back then!