I fixed a $325 Hobie 16- same deal. The guy swore it was in the water only 6 mo--- it was maybe 6 years- in Florida so you can imagine the weeds. 500 blisters per side but the decks were solid; I excavated all the non-structural surface blisters, filled with Bondo, epoxy primered ($100), sanded and sprayed gelcoat ($20). Looked like crap with the orange peel. More sanding and buffing, and after all this work I ended up with a $700 boat. NOT WORTH IT!