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Edge gluing Purple Heart & Gonçalo Alves/tiger wood

9/24/16       
Pete D Member

Has anyone had any issues edge gluing exotic lumber like Purple Heart and Gonçalo Alves/tiger wood with titebond I? Any surface treatment help like wiping with acetone, sanding to a specific grit prior to glue up, or is gluing right after edge jointing sufficient?

9/29/16       #2: Edge gluing Purple Heart & Gonç ...
Keith Newton

Pete, One thing to watch out for, is that the drying can be very slow in some of these very resin rich dense woods. They can be so slow to absorb the moisture out of the glue, it still thinks it is in the bottle after sitting overnight in the clamps, so leave it clamped longer than you would normally.

It might even be worth gluing up some scrap at the same time, so you can test it for your QC before moving ahead too soon.

9/29/16       #3: Edge gluing Purple Heart & Gonç ...
Pete D Member

Keith, thanks for the heads up. I researched a little more and found no definitive answers other than wiping with acetone right before glue up is recommended. Epoxies and urethane glues seemed to be recommended over the water based although PVA's can work. Titebond II & III were noted to have better results with oily exotics over titebond I. Think you're right...probably best to do some tests first with off cuts.

9/29/16       #4: Edge gluing Purple Heart & Gonç ...
Keith Newton

Pete, I use quite a bit of epoxy, but not for edge gluing. The molecules are too large to actually penetrate the cell wall, so depend on needing a texture to grab onto.

I'm wondering if this might be a time to use gorilla type, as much as I hate using that stuff.
T II and III are both slower set than TI, so be careful. Warmth can speed them some.

9/29/16       #5: Edge gluing Purple Heart & Gonç ...
Pete D Member

I never use epoxy, that's good to know. All my work is solid wood furniture so I use titebond I for almost everything, occasionally titebond III for longer open time. The one time I tried gorilla glue the joints erupted in a foamy mess and I swore off the stuff, but I am curious if the dense exotics is a better application. I'll try some tests with the urethane & PVA's and see if there's a noticeable difference. Thanks for your input!

10/7/16       #6: Edge gluing Purple Heart & Gonç ...
David R Sochar Member

In conversation with glue techs, I have been told that water based glues benefit from the solvent wipe before glue to remove and resins on the surface that might block the penetration.
However, solvent based glues - Urethane and epoxy - do not require the wipe down since their solvents will go thru any resins and penetrate.
I am not sure where plastic resin glue fits in.

10/7/16       #7: Edge gluing Purple Heart & Gonç ...
Jeff Pitcher

Powdered plastic resin (aka urea formaldehyde resin) should be treated the same way as a pva glue in terms of surface prep. Machining the wood just prior to gluing is the best practice and may do away with the need for a solvent wipe.

10/9/16       #8: Edge gluing Purple Heart & Gonç ...
Pete D Member

David & Jeff, thanks for posting, that's the info I was looking for.

12/27/16       #9: Edge gluing Purple Heart & Gonç ...
Larry

I've got several furniture pc. I made over 30 years ago with those woods, still fine, Original Titebond, not solvent wiped. But I always glue soon after machining.


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