Cleaning up body lines

I posted this same information on the Member's Restorations forum, but didn't get any responses, so I figured I'd post it here as well where there is a more focused interest.
Question for you guys who have done this . . . . I am having a hell of a time chasing the body lines down the quarters to get them nice and straight. These were new skins, so I am not trying to fix underlying damage as much as I am trying to make it better. I am looking for suggestions on what has worked for you. Part of the problem is that the lines are so faint in some areas that they are hard to even follow. The most troublesome is the line down the middle of the quarter (all 6-1/2 feet of it!). I need to sharpen this up so that I can make sure the contour going up from there to the top edge nice and smooth since that is where the welded seam is located. Last night I ran a tape line along the top side of the edge from the door jamb to the rear edge of the panel and then ran another tape line parallel to that, about 4" down from there. In between the two lines I applied some filler up to the tape edge on the body line using the lower tape line as an intended guide for the area I wanted to use to blend to the edge.
View attachment 1715590875 Will be pulling the tape and sanding that hard edge to smooth it and then repeating the process, coming at the hard edge from the other side with filler to recreate the edge. If you can follow my attempt to describe what I am doing, am I on the right track? Do I need to do something differently? Recommendations from lessons learned the hard way? I have never tried something like this before and to be honest it is kicking my ***! Thanks in advance for any assistance you can provide! L8r

Jim
I feel your pain!!! But, just like they replied above, the lines are plentiful and long. Then, just when you think you have a handle on it and it's coming along, you come to that long rounded line at the wheel well. :BangHead:
I haven't tried to use tape as a guide; just glaze and sand, glaze and sand....Now I know why body work is so expensive. I would starve to death if I had to do this for a living. This is my first experience with body work also; I really think patience and elbow grease are the only "secrets" I can share.
20200629_150927.jpg