A rotary buffer is the ONLY way you can resto gelcoat.
You might "burn" radi if your not careful.
Use 3m Imperial with a Wool bonnet pad and press like hell to get out heavy oxidation ( yes 3m super duty is needed for neglected gel surfaces ).
Most times your trying to remove crap coatings that have failed off of the gel than actually de-oxidizing it..
Im gonna say this one more time .. DO NOT WAX GELCOAT !!! In fact Do NOT apply anything to gelcoat period.
If your not up to the task of "rubbing/buffing" gel then you need a pro that does not use anything other then a pad and some compound that does not have Petrol or Silicates in it.
All your going to do is Burn that crap on and/or into the gel .. then your boned to wetsanding and buffing that crap off !
Not saying this is your ill .. but it probably is
.
YD.