The original gel on my 1980 202 is still I’m excellent condition, was a bit yellowed, but I was able to get rid of that by light sanding.
The schwaballac gel coat of that era was very good indeed. Ive seen vorgelat gelled gliders needing a refinish after 10 years.
As long as schwaballac is not cracked, which is rare, it can be safely painted over without total removal, Vogelat must be completely removed.