Many others may not agree with this, but here goes
You should never wax gelcoat. Wax and the silicone that's in it reacts in negative ways with UV rays, doesn't allow the gelcoat to breathe, all of which speeds up oxidation.
One product that has neither wax nor silcone is NuFinish. Mildly abrasive so it's great for removing light scratches and oxidation.so And it's cheap.
Another product that has neither is Dri Wash n Guard. Not so cheap but a $40 quart last's a long time, and on a clean boat it's just a wipe-on-wipe-off affair. it's good stuff--next time you're at the SS and K-boat races, ask the drivers what they use...
If you have a little heavier oxidation, try Bar Keepers Friend LIQUID cleanser. It works and won't hurt your boat. I made a video of me using it on the Chap 262...
If you insist on wax, NEVER wax below the waterline. That nice smooth, super-slick finish increases the surface tension between the water and the boat. Which means more drag.