Since I removed quite some gel coat I sprayed the left tip with epoxy primer.
I used a thicker 2K epoxy primer:
This primer needs mixing 3:1 and maximum 15% thinned, the nozzle is 2.0.
The first result was a quite rough finish and quite some pin holes showed up:
After curing I sanded the tip with 120 grid sandpaper glued on a foam block and filled the pinholes. I experimented a bit with the gun settings and raised the air pressure and thinned the primer to the maximum 15%. Thereafter gave the tip a second coat, much better but still some orange peel:
