We owned a 1962, 55' Norseman Sport-fishing boat built of port orford cedar with batten seam construction. Every plank was also glued to the next in a tight seamed carvel type planking with 5200 or the equivalent. The boat was attacked by isopods in 2006 and when we hauled her there was a yard mishap and the slings shifted. The slings pulled through the bottom in the engine space. Ultimately it was decided to scrap her and that's when we discovered that the Isopods bored into everything but the 5200 seams. They essentially bounced off. We did some testing and discovered there is a sweet spot (shore hardness) that they absolutely will not or can not penetrate. These guys can bore into coral on the hard end and rope on the soft. If you have ever worked on a Norseman you know replacing a plank is damned hard. The 5200 certainly bonds tenaciously to the plank edges and the only way to get it apart is with a sawzall or some such. 45 + years of in the water on these hulls says 5200 can be appropriate just not traditional. Based on this testing we set out to put a condom treatment on the bottom of our 80' YP (YP668) that would still allow it to be and react like a wooden boat. We hauled her in 2008 for maybe 8 months The boat is double planked with VG Alaskan Yellow Cedar (one of the worlds most durable wood) about 2 inches thick, with the exception of the Garboard, Broad and Shear planks which are VG white Oak. Frames are also white oak on 12 inch centers, some sawn, some grown. The navy spec called for 5200 between inner and outer planks on muslin in lieu of traditional bedding compounds.We wooded the boat and reefed all the seams. Then proceeded to replace a few thousand fasteners. We splined the keel to the garboard and the garboard to the broad with VG fir and Smiths all-wood epoxy. The hull was allowed to dry out for months and then about 40 gallons of Smiths CPES applied. All seams and fastener countersinks were then payed with 3M 5200. Then 30 gallons Sherwin Williams Corothane Mio Aluminum Polyurethane. Plus 30 gallons Sherwin Williams Corothane Coal Tar Polyurethane on top of that. And Finally 20 Gallons Sherwin Williams Seaguard ablative bottom paint. The worm-shoe was replaced with a 1" thick plate of Starboard which was bonded to sheets of sanded micarta and then bed in 3M 5200. The Keel is a 17 layer (1"each) white oak laminate. We lifted the boat off of the marine rail with a single 50 ton jack to install the worm-shoe. Now with the boat only being supported at two points 60 feet apart we checked every door and hatch and there was no binding anywhere. This boat is built like a tank. Again, not traditional, but it has been perfect in two subsequent haul outs. This is almost unheard of in our location. The marine borers hers are brutal. The Norseman was painted with the best tin based bottom paint and in 18 months the hull was Swiss cheese. Our 80 foot boat is docked about 100 feet away from where the Norseman was. We put together a cloud view of all the original drawings of the big boat plus all the hull prep photos. Just open any folder on our goggle drive below. If any one wants more info about our boat just let me know and I will direct you to the appropriate. By the way 5200 does not adhere to wet wood. So it is imperative to get the hull moisture down which is what kicked our butt for months. Once the CPES was applied and the solvents were allowed a week to escape we were able to proceed with confidence. This wasn't true with the Tremco products we purchased. We followed their schedules religiously and their system failed. They did refund our purchases (about $8000.00) but of course not the labor. On the other hand, Sherwin Williams has always been a class act when it comes to help. PS. If 5200 even thinks there is alcohol within its range it will never cure. Alas, we have become to old for the big boat. On to the next adventure. https://drive.google.com/drive/folde...DdQc0hfb1BzMDA

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