Well if he is a professional that would be worth the money for inside and outside. The finesse system is the ticket, with 1500 and 3000 paper on a orbital sander with water applied. If the boat is really porous you can use 1200 then follow up with 3000. Their is even 5000 available. After this then comes the fine compounds and polish along with the special foam pads. Yes it is a little complicated but not for someone who has did this.OH, after thats done wax with the best marine wax and it will last all year.Fiberglass is amazing material it will come back in most cases and hold up with a little care!