GC50 Gelcoat question

I've read that the gelcoat actually isn't easy to brush apply on the mold, neither with a roller.

however, on the website they say it is possible.

Is it possible to give it 1 layer gelcoat, even if it has the 'fisheye' effect, let this layer cure, and then add a 2nd one to fill the rest of the inpurity's

(fisheye or other little dots).

would it be a good idea to sand the layer once its cured, so the carbon or kevlar wave can't be disturbed by an uneven coat?

sorry if it's a stupid question, but i dont know weither i'd buy the spraygun or try it with a brush first