Wash
Compound
Polish
Seal
If there's oxidation you'll want to clean your pads often as they will cake-up with dead, oxidized gel-coat.
As a "general" rule of thumb, you can use automotive compounds and polishes on gel-coats but you don't want to use Marine grade compounds and polishes on automotive finishes as Marine grade products tend to be more aggressive than automotive products and can damage thin, scratch-sensitive clear coat finishes very quickly.
On the other side of the coin, automotive compounds usually won't be aggressive enough to tackle extreme oxidation quickly and efficiently.
Here's a thread with pictures of my boat and in the thread just for fun I used 4-5 different brands to buff out different sections of the boat. When I bought this boat it was pretty much white with oxidation.
Lots of pictures... --> 1967 Starline Deville - Extreme Makeover
The entire boat looked like the triangular section on the rear, right section you see in this picture.
Before
After
After everything inside and out was cut and polished...
Sad to say that the front bow has oxidized again. I'll have it in the Studio this Saturday to remove the oxidation and restore the gloss.
Keep in mind this hull is 44 years old...