If you use a wax based polish you have to go to great lengths removing it if you want to do repairs to the glass/gel as wax will produce an edge to the repair. I think that's right. When using a mould for fibreglassing you do coat it with wax so it will release from the mould.
Using non wax polish is a short term thing, it has to be repeated from time to time. I've used the 3m ones as well as ordinary car polish and the usual collection of high priced marine ones [which only have a different label on

]
Oh yes, don't polish the non skid areas