Try these guy's, (Cape Cod Truck in Orleans)
http://capecodtruck.com/ I had them do my 27. even the sides !!! They came to my house and did not make a mess, I think it is cheaper if you bring the boat there. I would not hesitate on the bottom, if the sides of your boats are in good shape, I may not do it. They are very good. I used to have a contact there, but I don't remember his name. Maybe search my old posts if I mentioned it before.
Dan