It certainly can be depending upon how badly the boat has oxidized. I know that I have never found a PC to be particularly effective on Gel Coats. I like using a PC but it's kind of like bringing a knife to a gun fight with Gel Coat. It almost always requires a rotary with a fairly aggressive polish. If it is a colored Gel Coat it will really stain your pads, to the point where they aren't of value on anything else.
That brings up a question I've never asked. Do others have a method of cleaning pads with this problem? In the past I've tried a lot of different techniques and haven't found anything that worked very well. There are a couple of boats that I've done several times and I've just given the pads to the owner and told him to save them for the next time I work on his boat.
I'm not saying that the boat you are doing will need this but I've had several owners tell me that they just want their boat waxed. In reality if I were to have only waxed their boat you probably would not have been able to tell I had even worked on the finish. Many owners thoroughly clean their boats only once or twice a season and these toys live in very harsh environments.