I have high moisture readings below water line on starboard side. The surveyer suggested delamination is possible . The bottom of oday 28 1982 is or is not cored is my question. He said high readings at numerous locations. Has anyone else out there had the same problem if so what should a fellow do next.
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not cored
the hull of the O"Day 28 is NOT cored. It is solid fiberglass. That is not to say that fiberglass can have moisture. It can. Some of the layup may be delaminating, the fibers may be starting to deteriorate. It may also be that water is collecting behind the gel coat.(osmotic blistering) I would strip off all bottom paint right down to the glass and let it dry out over the winter. Look for blisters and grind out. In the spring, check it again with a moisture meter ( high mositure content is anything above 2-3%) Then, with epoxy, fill in holes, fair, barrier coat, bottom paint. I know it's alot of work, but it's worth it.
the hull of the O"Day 28 is NOT cored. It is solid fiberglass. That is not to say that fiberglass can have moisture. It can. Some of the layup may be delaminating, the fibers may be starting to deteriorate. It may also be that water is collecting behind the gel coat.(osmotic blistering) I would strip off all bottom paint right down to the glass and let it dry out over the winter. Look for blisters and grind out. In the spring, check it again with a moisture meter ( high mositure content is anything above 2-3%) Then, with epoxy, fill in holes, fair, barrier coat, bottom paint. I know it's alot of work, but it's worth it.
never heard of tar on bottom
the Vc should come off with interlux paint stripper ( or wet sanding) I've NEVER heard of anyone putting tar on a fiberglas bottom....maybe acetone??? You got me on that one. Best of luck
the Vc should come off with interlux paint stripper ( or wet sanding) I've NEVER heard of anyone putting tar on a fiberglas bottom....maybe acetone??? You got me on that one. Best of luck
Tar as in VC Tar
My O'day 28 has a VC Tar barrier coat over which I too put VC 17 as an anti fouling coating. My "tar" coating is cracked and checked and I intend to remove it one day. Those who have done so say it can best be sanded off to the gel coat then reapplied. It's expensive, hard to use and darn well worth it. If I had moisture issues in the roving I'd strip the bottom and do as Mike C recommends. Good luck Mike S/B Pitterpat, Lake Huron
My O'day 28 has a VC Tar barrier coat over which I too put VC 17 as an anti fouling coating. My "tar" coating is cracked and checked and I intend to remove it one day. Those who have done so say it can best be sanded off to the gel coat then reapplied. It's expensive, hard to use and darn well worth it. If I had moisture issues in the roving I'd strip the bottom and do as Mike C recommends. Good luck Mike S/B Pitterpat, Lake Huron
William,
Your boat does not have a cored hull. When a boat is laid up, it has fiberglass cloth ( this could be matt, cloth or roving and most likely a combination of all the above. same material different weave and weight)which then has polyester resin and hardner applied in a given proportion ( to much resin is brittle and not enough is not enough). The fiberglass matt, cloth, or roving does not deteriorate. If too much resin was used, flexing could break the bond between the layers of cloth because the resin is to thick and brittle. I think your problem is that some of the cloth did not get enough resin. Because your gel coat is porous, moisture slowly penetrats the gel coat and collects in the areas of the cloth that was not saturated by the resin. I would not be alarmed, this is a big production problem and often misunderstood. Unless you intend to sacrific this boat to the sea in multipul crossings of large expanses of ocean i would live with it. Most owners don't even know they have the problem. Normally this occurs in one of many layers of lay-up. It is like a knot hole in the middle of a plywood sheet. Yes it is abit weaker but is normally contained in small areas (less than a square foot) REPAIR Clean up the hull (take the bottom paint off to the gelcoat) Repair blisters if you have them ( go through breaking them open then drying them out then a proper repair) apply a barrier coat, Interlux 2000 , 3000 or VC tar or anything of the like according to manufacturers advice. ( thats right discuss application with the manufacturer of the product you will use. Directions are not always enough and the manufacturer may have great tips on temp and application.) Apply your antifoul of choice and your off. R.W.Landau
Your boat does not have a cored hull. When a boat is laid up, it has fiberglass cloth ( this could be matt, cloth or roving and most likely a combination of all the above. same material different weave and weight)which then has polyester resin and hardner applied in a given proportion ( to much resin is brittle and not enough is not enough). The fiberglass matt, cloth, or roving does not deteriorate. If too much resin was used, flexing could break the bond between the layers of cloth because the resin is to thick and brittle. I think your problem is that some of the cloth did not get enough resin. Because your gel coat is porous, moisture slowly penetrats the gel coat and collects in the areas of the cloth that was not saturated by the resin. I would not be alarmed, this is a big production problem and often misunderstood. Unless you intend to sacrific this boat to the sea in multipul crossings of large expanses of ocean i would live with it. Most owners don't even know they have the problem. Normally this occurs in one of many layers of lay-up. It is like a knot hole in the middle of a plywood sheet. Yes it is abit weaker but is normally contained in small areas (less than a square foot) REPAIR Clean up the hull (take the bottom paint off to the gelcoat) Repair blisters if you have them ( go through breaking them open then drying them out then a proper repair) apply a barrier coat, Interlux 2000 , 3000 or VC tar or anything of the like according to manufacturers advice. ( thats right discuss application with the manufacturer of the product you will use. Directions are not always enough and the manufacturer may have great tips on temp and application.) Apply your antifoul of choice and your off. R.W.Landau
Something else...
William, It is just as important to keep water from going through the hull from the inside. Keep a dry bilge and if you can , and while you are working on the outside of the boat, barrier coat the inside. r.w.landau
William, It is just as important to keep water from going through the hull from the inside. Keep a dry bilge and if you can , and while you are working on the outside of the boat, barrier coat the inside. r.w.landau
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