Removing the old paint “edges”

How in the world do you get rid of the edges of the original base coat/paint???

I’m assuming if you can see “it” in the primer coat, you can see the same in the base coat, right?

I have sanded through the stages/grits (80-100-220-400-1000-3000) as I understand them, but while it worked in some areas, not so much in others. All I seem to be doing is moving the edge further back and never fully removing that stupid edge.

I am no where near a body guy, but I can’t seem to justify the cost of someone else doing it. I’m getting closer to justifying no doubt, but not there yet. There’s not a lot of “body work”, it’s more paint work. That said I didn’t see the point in media blasting the whole car. So I thought, work the edges, smooth them out,...... prime, sand, prime, sand and paint.....

Regardless, any pointers on smoothing the edges is appreciated.

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