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Plane Off TiteBond III?6/5
so I glued up some clear 2x8 and didn't wait long enough for the glue to dry and the two pieces separated pretty easily ...
can I run the one face thru my planer to remove the glue or will that gum up the knives??
Cedar? As in Western Red Cedar?
Yes, you can plane the glue off as long as it is dry.
If it is cedar, it is not you or the clamp time that caused the glue failure. It is the glue and the wood.
I had some spectacular failures with TBIII and WRC a year ago, and talked to the glue techs. It turns out that in about 10-20% of WRC has a high enough resin content to repel the glue absorption.
Look at your failed bond - the glue has not gone into the wood, and is gummy since the wood did not absorb the moisture - it repelled it.
I was told to clean the surfaces to be bonded with a clean rag and acetone, and wipe until no brown came off the wood anymore. Then it can be bonded, right away. Try doing that to mortise and tenon joints!
We tried it on some boards, and it will work, but I did not feel confident. We would have to spend a lot of time wiping it all down since you can not tell which boards have the high resin content by looking.
The glue tech explained that any water based glue (aliphatics, urea resin) will have the same problem, but solvent base glues will not (epoxy, urethane, resorcinol).
This bit o' info is little known amongst woodworkers, and I see cedar glued this way all the time. But not by us anymore.
Yeah I've heard that about wr cedar but I've never had a problem. I scuffed up / scratched both faces before gluing, it was a coldish night and I took the clamps off too soon the next day.
Good knowing I can plane that glue off!
I have restored many century-old, elaborate apartment-building doorways, and the acetone-washing is necessary to get varnish to adhere well to oily woods like mahogany. There's another bonus, too. Removing the oils from the surface also prevents them from interacting with the chemicals in the varnish and producing strange color splotches. I was really stumped when I did my first mahogany entryway and the varnishing produced purplish and orangey blotches. But I saw the acetone tip on a wooden-boat website, and the results were beautiful.