View Full Version : I'm thinking linseed oil mixed with?
10-05-2009, 01:07 PM
I recently finished a Town Class Sailboat Restoration. It is Northeast Pine over Oak ribs, lapstraked. The strakes are silicone bronze bolted and glued with 5200 and there are three bottom planks that are 1 1/2" Thick and butted together. I used a silicone caulking between these planks and everything is tight. The boat is dry sailed.
When the boat is in the water, it is very tight and hardly leaks at all at rest. Undersail, it is a differnt matter The bow planks have small cracks on the flat bottom and I think they are opening up when the mast has pressure on it under sail. I can not see where the water is coming in, I know it is not with the strakes. I think it is up under the bow where I have limited access. The bottom cracks are too small to caulk. Is there something I can pour from the inside that might seal these and that I can paint over with oil paint? I was thinking that linseed oil, mixed with a filler might work. Any help would be appreciated.
I would say "No, there's nothing in that line that will do what you want". The only thing close would be SlickSeam, a waxy mixture now a Davis product. A home made version can be made by melting bees wax with rosin and then adding linseed oil or pine tar to make the mixture workable when cool. How any of these would work poured (hot or warm) into the inside to fill cracks is questionable and not likely. They can be laid on the outside and the surface cleaned with thinner.
10-05-2009, 01:44 PM
Welcome to the forum. The above mentioned products are designed to squeeze out when wood takes up. You have the opposite problem. Cracks don't open until the rig puts stress on them. Even a tingle laid on from the outboard side probably wouldn't hold due to the spreading stresses. It sounds like a structural issue. You'll get some good advice here
10-05-2009, 01:51 PM
To me it sounds like you need to reinforce around the mast step.
10-05-2009, 01:53 PM
its not clear to me where the cracks are, but hot pitch is often used to level limber holes & may be what you need, however,
i dont know, or hot sealing wax
10-05-2009, 01:58 PM
.... there are three bottom planks that are 1 1/2" Thick and butted together. I used a silicone caulking between these planks and everything is tight. The boat is dry sailed.
The 3-plank bottom looks like this hull below?
And you butted the bottom boards together with silicone but no cotton caulking seams that look like this example below?
If so, your bottom isn't as tight as you think.....adding proper caulking seams will tighten the bottom sufficiently so the mast step won't distort it under load, and they will also close all the minor checking that is currently leaking.
You can have a circular sawblade ground to make this seam without dismantling the boat.
10-05-2009, 02:35 PM
you can put hot tallow into the crack outside, may be as aldebaran suggests the mast step
maybe make a stronger one
10-05-2009, 03:23 PM
Welcome. Please be as specific as possible about the products used -- for example silicone caulking is rarely used in boats, and makes any subsequent sealing of the seam nearly impossible.
I suspect that any liquid you force into cracks from the inside can be forced back out by water pressure, but we need more specifics and/or photos to offer much more.
10-05-2009, 04:12 PM
I'm afraid you used some techniques/products that really weren't suitable for the type of construction used in your boat. :(
Maybe you could talk to the folks at Pert Lowell Company and see if your maststep area is strong enough. Did you make any changes there?
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