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Oak filler

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Woodcrafts:
Did you use a metal tool to mix the paste or spread it? It only needs the smallest amount of iron, and the moisture of the glue on the metail can get that, for it to react with the tannin in the oak. Another possibility is if you used water to make the paste more workable, as that may well have iron compounds in it. I had a similar problem when making an oak table with a customer. He insisted on wiping off the excess glue with a damp rag (In my own workshop I let the glue go off then remove any excess with a paring chisel). The result was black staining all along the joint lines.

Woodcrafts:
I think you may have found the cause. I just noticed you posted that you used a steel knife to spread it, while I was typing my reply.

BrianH:
well there's a lesson for us all. I'm sure I wouldn't have thought of the spreader causing problems. In case the idea is new to readers I have been using the wooden knives on offer in Greggs to spread glue with. Works a treat..... and they're free!
Brian

willstewart:
Thanks all!  Very useful feedback, I think you have it and I will be much more careful in future.  Fortunately in this case (a long case clock) the filler is minimal and I can arrange for it to be behind out of sight.

Paul Hannaby:
A few years back I sanded and refinished our oak parquet floor. I bought some resin to mix with the sanding dust to make a filler to fill any gaps between blocks. I mixed a small sample using a metal spatula and the mix went black so I mixed another batch with a plastic mixer and applied it with a plastic spreader and it stayed the right colour - lesson learned! :-)

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