I'm replacing the floor in our boat and some of the videos and links I've looked at have gone back with a couple of coats of gel coat on top of the fiberclass. I'm wondering, is this vital to the floor restoration, or just cosmetic? This is my first floor job and just want to be sure I get it right. We plan on keeping the boat many more years and I don't want any regrets about "how I should have done it." Thanks.