I only know Chrome spray i saw in an art shop nearby my house. Give finish like mirror

Depends la if u are hardworking then remove it only do your mods. If u are lazy then just carry on ur mods without removing those stuff cause removing them nids hardwork - drilling the rivets out and when finished replacing them.
IMHO if u r doing a blowhole, either take out all the hardware inside and only cut or take off the top panel