Not really buffed, but color sanded and flowed out in an oven.
From the CRG assembly process article:
"Color System: The bodies were sequenced to "batch-paint" by color as much as possible, to minimize the waste of thinner required to clear paint guns between colors. The interior was masked off, the body exterior was tacked-off, and it then entered the first color booth, where it got three coats of acrylic lacquer, sprayed automatically with vertical and horizontal reciprocating spray guns, with a 3-minute "flash" between coats, followed by a 10-minute bake at 200F to "skin" the surface prior to sanding. In the next stage, any surface defects were power- and hand-wet-sanded with mineral spirits, then wiped off prior to entering the final "reflow" oven. This bake lasted 30 minutes at 275F, where the lacquer surface softened and "re-flowed" to a uniform gloss. The last process for a non-stripe car was the blackout booth, where the firewall was blacked-out, the trunk was sprayed with spatter paint, and sound-deadening undercoat material was sprayed in the rear wheelhouses. The rear "cocktail shakers" on convertibles were suspended in the trunk for spatter painting, but weren't bolted in place until later in the Trim Shop, after the taillights and marker lights were installed.
If the car required Z-28, Z-10, or Z-11 stripes or a black rear end panel or rockers, they were masked and sprayed in the in-line repair booth/oven system after the reflow oven, including the cowl vent panel; spoilers were painted and striped separate from the body and were installed before the body went back downstairs to the Trim Shop."