You can use the same materials as with a regular sheet metal repair.
Rough with 180, and fill with a 2 part glazing putty.
sand again with 180 and feather with 320..
a 2 part primer then sand as usual with 400
blend in some color, then clear complete.
wait 18 hours ...detail any nibs/peel with 2000 then polish
take your time, keep it fun...