[NiftySVX]

Yes, this is common in Japanese vehicles of this vintage, maybe others too. Toyota has a similar procedure outlined in their body repair manuals for each model. (the body was in a section separate from the main manual)

I have never heard of anyone making use of the information or procedures. There is also a specific procedure for repairing and painting the deckled on the SVX. No one follows that either and it's why repainted deck lids chip so easily