to add to Paul’s great info:
3M also makes a complete line of gel-coat restoration and care products. These are available at any good Marine supply. I am lucky, we have a West Marine store close by.
Also, 3M and Meguiar make a clear plastic cleaner and “polish” for the convertible top rear window and side windows. It keeps them scratch free and clear.
I also buy most of my “brightwork” and hardware at a Marine Supply too. The stuff is higher quality and the hardware is stainless steel.