Darryl Keil Last Activity 2025-09-09 11:09 AM
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Richard

 
Subject : glue failure, please advise
Posted : 2004-01-27 10:31 PM
Post #31237
I have been doing veneer work for a good many years, but today I ran into a new problem. I have laid up several panels using 1" mdf and maple veneers, using weldwood plastic resin (urea formaldehyde) as an adhesive. I took a panel out of the press after 12 hours and a corner of the veneer pulled up a bit. I took hold of the overhang and pulled the entire veneer face off in one piece. I pulled the other panel out...same thing. There was fully cured adhesive left on both substrate and veneer. O.K. I am now officially sold on Unibond, but what could have caused the failure? I measured the product carefully and hat electric blankets warming my press. I feel that I must scrap the previous panels I have pressed for this project, and I'm glad I discovered the problem before I assembled anything. Anyone have a similar experience? Thanks


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: glue failure, please advise
Posted : 2004-01-28 8:03 PM
Post #31241 - In reply to #31237
Richard,

Your description of the glue failure is commonly caused by too low of a temperature but you said you were using a heat blanket so Im not sure on that one. The other thing that happens with powdered urea resin glue is that it can go bad if its not real fresh. Its hard to tell when you mix it so I never buy it from a hardware store or any place that might have had it sitting around. I also let panels sit for 24 hrs before testing adhesion. Yours was peeling up at a corner so it still was probably no good but I would wait anyway. Could have just been the corner, maybe.

I wouldnt scrap your other panels from this job. Test around the edges and see if you can pull up the veneer. Also wipe the panels down with water. If the veneer is not well adhered it will usually bubble up in some areas. Just because one panel is bad doesnt mean the whole batch is, although they could be.

Sincerely
Darryl Keil
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