Been doing a little research on my newly acquired 74 Marlin 18'- I have found a decent variety of early 70's manufacturers whose hulls look exactly like my Marlin, such as Sidewinders, CobraJet, and others- Did these guys share the same molds, or what? Also- has anyone tried the gelcoat resto product called Vertglas, and if so, how did it turn out? My gel coat is the early 70's heavy metallic, and is faded beyond hope. Thanks in advance.