My $0.02;
Consider how long much life do you want to give this hull and how soon do you want to be fishing. If you want it to last 5-6 years, the least cost, and on the water soon, go with good exterior plywood and vynilester resin and knock it out.
If you want something your going to pass down (not get your $ back on)
Use Nidacore for your Decks and Floor laminated with Polyester Resin and 1308 Glass. My experience is that 12oz Biaxial is good for decks, some folks say more some less, 1308 Bia worked for me. Nidacore is cheaper than the Diab products and will do the job on horizontal non-structural parts. Use Epoxy to bond them to the boat though, not the polyester resin. Use Divinycell H45 (Diab 45) for Bulkheads and vertical structure, Nidacore doesn't have enough strength on end. If it's an old school solid fiberglass hull that was very thick, it may not need "stringers" that weren't already there. If your replacing existing stringers or just feel they are needed, use at least 8lb two part foam, but 16lb is better. It sets rock hard and very strong. Use 2lb foam for flotation, if you feel the need to not sink in a emergent situation. If your going the "no rot" route you could also do your transom out of poured 16lb foam or some of the higher density Diab product.
Check some online resources for your material too. I'm not saying anything negative about Fiberglass Coating, I've bought from them when I didn't want to wait for something to be shipped, but I've come to the conclusion that I'll waste more on gas and wasted time driving to get my materials then just ordering them and having them delivered to my door. Here are some of the places I've used;
http://www.carbonfiberglass.com/ (illstreet composites)
http://www.compositesone.com/ (bought my NidaCore from them wholesale, wholesaler not online)
http://www.sollercomposites.com/
http://www.uscomposites.com/ (Foam)
Hope this helps.
Consider how long much life do you want to give this hull and how soon do you want to be fishing. If you want it to last 5-6 years, the least cost, and on the water soon, go with good exterior plywood and vynilester resin and knock it out.
If you want something your going to pass down (not get your $ back on)
Use Nidacore for your Decks and Floor laminated with Polyester Resin and 1308 Glass. My experience is that 12oz Biaxial is good for decks, some folks say more some less, 1308 Bia worked for me. Nidacore is cheaper than the Diab products and will do the job on horizontal non-structural parts. Use Epoxy to bond them to the boat though, not the polyester resin. Use Divinycell H45 (Diab 45) for Bulkheads and vertical structure, Nidacore doesn't have enough strength on end. If it's an old school solid fiberglass hull that was very thick, it may not need "stringers" that weren't already there. If your replacing existing stringers or just feel they are needed, use at least 8lb two part foam, but 16lb is better. It sets rock hard and very strong. Use 2lb foam for flotation, if you feel the need to not sink in a emergent situation. If your going the "no rot" route you could also do your transom out of poured 16lb foam or some of the higher density Diab product.
Check some online resources for your material too. I'm not saying anything negative about Fiberglass Coating, I've bought from them when I didn't want to wait for something to be shipped, but I've come to the conclusion that I'll waste more on gas and wasted time driving to get my materials then just ordering them and having them delivered to my door. Here are some of the places I've used;
http://www.carbonfiberglass.com/ (illstreet composites)
http://www.compositesone.com/ (bought my NidaCore from them wholesale, wholesaler not online)
http://www.sollercomposites.com/
http://www.uscomposites.com/ (Foam)
Hope this helps.
