I recently tested out a few things over MM Metalizer Aluminum (buffing). All 3 things I tried over it were easy to flake off with a toothpick. So, try Future over metalizer on a test part before going to the trouble of doing the entire model like that. It does work, but it is not very chip resistant.
Of the 3 things I tested over Aluminum (buffing) metalizer, even metalizer sealer was rather easy to chip. The runner up was Future, so Future was a little more flaky. The most easily chippable was Acryl clear green.
Another option is to put the non-buffing Aluminum metalizer over it and let it be as it is without a sealer. The non-buffing ones do great without a top coat or sealer. I don't know why; they just don't rub off as easy. They aren't as susceptible to fingerprints. They just seem to dry like regular paint. That metalizer might be more chromelike than what you are aiming for though.
I just remembered... those clear lacquers from Testors in the bigger jars work great over mm metalizer.