You can bring back the factory shine with a rotary polisher (not orbital) and use 3M super duty rubbing compound.
Here's my boat that was highly neglected before I bought it.
If you follow it up with a good wax... the shine will last a long time.
As you can see... they start out as egg shell dull... and finish as glossy as any factory finish.
Before:
After:
Finished:
And here's my 1990 Si
Before:
After:
Finished:
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