Renew any Gelcoat
I had a red boat that oxidized to an ugly mess. I also had a 40 year old catamaran sailboat that had oxidized badly. I tried every polish and renew product available and got lousy results. Finally, I went to a Corvette shop and asked them what they do. They recommended a product called Penetrol. A quart can is about $10 and you can get it at any paint store or Home Depot or Lowes. It is a plasticizer and it is amazing. Clean off any wax that is on the surface. Do a wax on wax off with a rag. Do small areas because you only want the stuff to stay on for a minute or two. Use a clean rag to wipe it off. Wait 24 hours and apply a new coat of wax and it will look brand new or better.
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