Join Date: Mar 2010
Location: SF - South Bay
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Re: Teak crack
Sadly photos help, but don't always give the full picture! The best fix really depends on a close examination of the wood and design.
I would gently pry the crack open, and then inject acetone (typically your local epoxy/fiberglass shop sells syringes). Then inject glue, clamp, and remember to drill a pilot hole before refitting.
Other options would be to reinforce the area by gluing a new piece of teak or another wood over the damaged area, as a split like this is likely to recur. In larger pieces a "butterfly" piece can be attractive; in this case, a linear piece (sometimes called a Dutchman) could be glued over the weak area. This piece should be beveled on either side, the grain aligned, and epoxied into place. This could then be drilled and provide a fresh anchor point.
Alternatively, after gluing, you could drill a slightly larger hole, fill it with thickened epoxy, and then drip and anchor into this plug. Less likely to split.
You may also want to consider putting one or two layers of fiberglass over the area. When sanded flat, it is transparent (you can varnish it) and it will provide further reinforcement. And of course, acetone wash before any epoxy/glue. It is a bit tricky though to use a small enough amount to not bee visible, but big enough to reinforce!
I'll look around for some images to show you some of these splices.