Hi all,

The last coat that I put on the plug is 4:1 Filler primer wich is a 2 pack product. Water paper with 220/320 then 600 then 1000 grit.
Next take contour tape, plastic automotive panel beeter stuf. Stick a strip to a cleen mirror and cut into thin strips with a steel rule and a hobby knife.
Stick the thin strips over the plug where the pannel lines must be.
Spray 2 pack 4:1 filler primer over the tape and about 1" either side to give a soft lead in to the build up of filler. Spray only until the tape is covered.
When the primer is rubbery dry, use a hobby knife to lift the end, and pull back on its self. It will tear through the middle of the "Pannel line".
When completely dry, about 24 hours, or can be sanded with 600 with out clogging the paper.
Take 600 water paper wrapped around a wood block with a sharpish corner. Use the corner to sand along the pannel line to clean it up.
Take 1000 water paper and sand with your finger to give a smooth flow over the pannel line. Sharp corners dont mold very well.
Polish with 1000 wet.

Give it a go.
Dale

PS All sanding is done WET.