When the Hempel filler had cured I sanded the affected surfaces flat with a P220 grit and applied four more coats of paint.
This is the paint I am using. The colour is Oxford Blue, appropriately enough!
I used this roller and a foam brush for tipping out.
I left the paint to fully harden for a couple of days and then sanded the surface with a P280 grit to get a nice flat surface. As here.
Lastly I applied a sixth coat of gloss, hoping it would be the last. This was the result.
When the paint was dry I pulled the masking tape on the stripes, as here.
It left a lovely sharp edge with no bleeding. This 3M tape is excellent stuff!