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Ipe
Its probably not the tannins bleeding out of the Ipe but rather the resins.
Usually tannins are boiled out of the wood. In the days of sail oak was used to dye the sails of commercial craft. The bark was harvested and boiled, the sail material was soaked in the brew. This was called tanbarking and left a reddish tinge to the sails and preserved them against the elemnets.
Ipe will release resins that can be problematic with some surface protectors. When gluing it, it is advisable to wash the joint with acetone, lacquer thinner, MEKs or acetone to remove the resin and allow good adhesion. I would recommend a wash coat of thinned epoxy after cleaning the surface with acetone. This is a very common menu for teak and other such resinous woods such as spanish cedar, and even white cedar to some extent. The longevity of the thinned epoxy coating depends on the amount of resin contained within the sample and the extent that the sample stays at a constant equilibrium moisture level ...use for plugs is not very conducive to a long lasting finishes, however Ipe is very reistant to decay and will last quite awhile.
Sorry for the long read
Ed
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Threaded Mode