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

Posts: 34

Joined: 2010-05-03
Location: Montana

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Subject : The new green Uni Bond 800
Posted : 2013-02-20 8:18 AM
Post #36849
So, I just glued up some veneer samples using the new "Green" Uni Bond 800.
I used 2 cups resin to .5 cups hardener (4-1 ratio)mixed thoroughly, let rest for 5 mins and then restirred. I applied a nice uniform light-medium coat. I then veneered both top and bottom substrate at the same time and used a .75 melamine call for the top. Left it in the press for 10 hours (cold press- no heat). I then opened the press took the melamine call off and noticed the glue (in the areas not veneerd) was thick and pliable. Question? Will the veneer be adheared appropriatly once oxygene has fully cured the glue to it's rock hard state?
Jason


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: The new green Uni Bond 800
Posted : 2013-02-20 12:09 PM
Post #36850 - In reply to #36849
Two answers, yes and maybe. Yes, the glue will finish its cure when exposed to air. Maybe, if the temp was below 70 degrees when you pressed your panel then the cure could be compromised. Bottom line, wait 24 hrs and you will know if everything cured up properly.

Darryl Keil


 
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Jason

Posts: 34

Joined: 2010-05-03
Location: Montana

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Subject : RE: The new green Uni Bond 800
Posted : 2013-02-20 12:23 PM
Post #36851 - In reply to #36850
Sounds good.
Thanks for the advice!


 
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Jason

Posts: 34

Joined: 2010-05-03
Location: Montana

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Subject : RE: The new green Uni Bond 800
Posted : 2013-02-20 9:31 PM
Post #36852 - In reply to #36850
Veneer was compromisd!
Granted it wasn't 24 hours, however, the glue was rock hard once the air cured it for 12 hours. I had noticed a little lifting on the edge,so I peel just a little, a little more, and finally lifted the entire piece of veneer right off the substrate! WOW!!!
What your saying is that within the initial pressing, your platten temp should be above 70 degrees or else you will have zero adhesion? My shop is at a constant +65 degrees. Is heat a major component to the UNI Bond 800? Maybe I should be using a different glue?
Help!


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: The new green Uni Bond 800
Posted : 2013-02-21 3:32 PM
Post #36853 - In reply to #36852
All urea resin glues require a certain level of temperature to bond and cure properly. Its the nature of the chemical reaction. This time of year can be a challenge so we like to recommend a common electric blanket used on a bed. If you find this solution not to your liking you may want to consider using the Unibond One as an alternative. Not as rigid as the Unibond 800 but still very hard for a PVA glue.


 
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Don Stephan

Posts: 825

Joined: 2003-07-18
Location: Cincinnati, Ohio

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Subject : RE: The new green Uni Bond 800
Posted : 2013-02-22 6:55 PM
Post #36855 - In reply to #36852
Jason:

Sorry to hear of your bad fortune. Many of us keep an electric blanket in the workshop for winter pressings. I left the workshop thermostat at 65 last night (instead of setting back to 55)and bumped it to 70 when I went in this morning. I also immediately placed the electric blanket on the bag and platen, turned it on HI, and covered with a furniture pad. By the time I finished some tasks and mixed the glue the platen had been warmed. Left the electric blanket on HI all day, then wrapped the sample pressing in the furniture pad and brought home for the weekend so it will stay above 70.
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