On 6/8/2013 5:30 PM, Leon wrote:
"G. Ross" wrote:
G. Ross wrote:
About 6 months ago I replaced a dowel in a table leg. The wood is
dark and fine-grained and looks like cherry. The leg is fastened to
the upright with two dowels about 5/8 " diameter. I glued both dowels
with titebond 2.

Yesterday the leg and post came back. It had come off again. The
glue on the new dowel was still soft and colored blue. Any ideas why
yellow glue would not set up, and why it turned blue? Would residue
of hide glue do this?

I posted a picture on abpw. This is from an old Duncan Pfyffe double
pedestal table. It belongs to a retired military family and has been
around the world with them. Apparently on the front lines. The legs
have been replaced using big screws, 10 penny nails, finish nails, etc.
I had to pull out a 10d common nail before I could get into the joint.


That looks like a more modern preglued dowel. The type glue I am thinking
about is activated by radio
frequency.

Back to your soft glue that did not set up and my previous comment about
the old glue still being present. Typical wood glue has to soak into the
wood to cure. If there was still a layer of the old glue sealing the hole
the glue that you used was probably sealed in an air tight and sealed from
bare wood situation. Basically no where for the moisture in the glue to
go.

Sounds about right, and like you suspected I think the hide glue is
reacting with the titebond causing the blue hue...


--
Jeff