Ugh, I noticed a wave in the rear fender body line from a run I sanded out. I put sharpie all over it as a guide coat and wet sanded with p1200 then buffed. I burned through again

I only put 2 coats of clear on in the first place, (advice from local body shop owner) I assume that suggestion was a save money business thing. anyway I am leaning on a complete re-clear because of the burn through's and the fact that out of those 2 coats there is likely only 1/2 coat left after sanding out all the orange peel.
It's been 2 weeks since I painted the tub.
Correct me if i'm wrong: I don't need to redo door jambs, rockers or trunk opening, just mask a soft edge and scuff around openings.
My biggest fear is that the new clear won't stick to the old (sanded of course) as Kevin from Eastwood points out it's now a mechanical bond not chemical.
question: Will this new clear bond, look, last as good as clear bonded to base?
If I want perfection should I start over from square one with paint stripper?