[tsubaki]

I'm still in the process of removeing old paint both properly and improperly installed on the upper deck. I'm having to use stripper and then sometimes watersand with sanding blocks and then buff with compound till it shines and then cover with wax to maintain some long term gloss.
Don't use any sanding stuff (grinders etc), just buy a cheap buffer (Harbor Freight etc) and get some good grade buffing compound and polish most likely from a professional auto body supply shop. Store chains usually don't carry real compound but what they got will work on very slightly oxidised coats.
Experiment on flat easy surfaces till you get the feel of it and shine desired.