I have an old Trillium
with an oxidized gel coat. After reading various threads on this site I decided to try a couple of methods.
The included image shows the two things I tried.
On the right is the result after using rubbing compound and two coats of Turtle wax. On the left is 3.5 coats of Zep High Traffic Floor Finish. Why do I say 3.5 coats, because it rained just after applying the second coat and it became streaked.
The left has more shine but the right is much smoother to the touch.
In the middle is the original surface after being washed.
The Zep application take much less effort.