While applying bottom paint this weekend I noticed some damage to the gelcoat on one of the strakes. About a 3 foot area on the edge is missing gelcoat. I believe the bottom paint may have been hiding the damage. I had the marina look at it today and they suggested that it be sanded and then epoxy, then more bottom paint. Is this an acceptable repair? Am I wrong to think that it needs a new layer of gelcoat as well? Advise is appreciated.