Have you ever use this product Aqua Buff? Go with 1000 then 2000 you will be amazed at the results trust me, I did very little sanding if any during my restoration with a cheap buffer from Harbor Freight.
https://www.amazon.com/POLISHING-Com...9548666&sr=8-2
The Best Fiberglass Boat, Metal & Automotive Paint Light Buffing & Polishing Finishing Compound On The Market!
This is results 12 years after the restoration in 2008/09