Covering well-dried enamel

[ActingLikeAKid]

Working on re-building a crashed rocket. The fincan and lower BT are painted (and still look reasonably good). The rest of the rocket is going to be new. The rocket is a mid-split rocket, so the upper part is all new; the lower part is half-old, half new. Paint is Rustoleum "Professional High Performance" enamel. I'm thinking in terms of strategy:

-Prime all the new parts (and sand as necessary & re-prime)
-Assemble the new BT to the old BT
-Sand and fill the joint area, down to the primer at the joint, tapering to "scuffing the paint" a few inches away.
-Prime over the joint(but not the scuffed paint) and resand/reprime
-repaint black enamel down to cover the scuffed paint
-When dry, wet-sand the tape line
-Cover everything with clear

Good plan? Am I missing something? The enamel is ~3 months old so it's well-cured.

If a picture helps:

 

[MikeyDSlagle]

I'd probably sand the old paint before going over it, 220 to 400 probably work. But as I reread you mention scuffing the old paint. So looks like you got it covered.

 

[ActingLikeAKid]

Awesome, thanks!