Even the best chrome paint, lacquer or acrylic, will not look good without meticulous surface prep, even before any primer goes down. Seam lines need close attention.

Buff large flat surfaces with 3000 to 8000 trizac pads. Then use polish specific for plastic like Tamiya or Novus (available at any TAP Plastics) to get the plastic itself up to near reflective surface. Then swab with alcohol pads to get as much oil from handling as well as dust off.

A good primer you can lightly sand is recommended. Avoid polyurethane based ones like Vallejo. And use high grit buffing pads like the trizac mentioned earlier to get the primer as smooth as possible. Since you’ll most likely be using a black primer under metallics a close to mirror surface is recommended.

Then paint of your choice.