Nahhhhh! Scratches are beauty marks. Our vintage Airstreams are expected to show some wear and experience. A deep scratch can be reduced with either an aggressive compounding or sanding (aluminum oxide) to a point where the compounding/[polish can take over. A common deep scratch that many of us face is the infamous too close bush or shrub that , wind blown, has caused deep scratching. If nothing else....make up a good war story as to the origin of the wound. Polish away.
"If it can't be reduced, reused, repaired, rebuilt, refurbished, refinished, resold, recycled or composted
then it should be restricted, redesigned or removed from production."