Darryl Keil Last Activity 2025-09-09 11:09 AM
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Don Stephan

Posts: 825

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

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Subject : Tips, Tricks for Making Two Ply Veneer
Posted : 2004-02-14 9:45 AM
Post #31290
In some of the old discussions on this forum, I learned that two ply can be made by temporarily taping the backer veneer to a surface, applying the glue to it, and then laying the face veneer on it. Beyond that, all is a mystery.

I will be veneering onto MDF with 1.5" hardwood edging already glued to it, so that the veneer will extend over the edging. Two ply will be used so that the glue joints do not telegraph and so that any movement of the hardwood edging will not crack the veneer.

I would greatly appreciate any tips, working experiences, etc. Is it faster to use regular veneer tape on the two outside surfaces and then sand it off the back surface of the backer before gluing the assembly to the substrate? Preferable? Does anyone use three hole veneer tape on both inside surfaces? How important is it to sand off any glue bleed through on the back side of the backer? Is it possible to use Unibond, which is very rigid when cured, to assemble two ply that will then go on a curved form? ... And any other questions that I would ask about this if more knowledgable. Thanks.


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: Tips, Tricks for Making Two Ply Veneer
Posted : 2004-02-14 12:33 PM
Post #31291 - In reply to #31290
Don,

Making two ply is really as simple as you described. The only things I would add is that I put 3 hole tape on the outside of the backer sheet which stays on when you glue the two ply to your substrate. Use no hole tape on the face veneer. As long as you have just a little bleed through I wouldnt be concered with sanding it.

As far as Unibond 800 being to rigid for curved ply, it has to be a rather tight radius befor its a concern, lets say under 10". And even with that you can lay the two ply up in the morning then press it to your substrate at the end of the day. Unibond 800 doesnt get real rigid until the next day. I also do a preliminary sanding and scraping of the two ply before I glue it to any curved substrate. I just double sticky tape it to my bench and go at it.

If your not going to use the two ply immediately I always keep it weighted under some plywood as it will curl as it dries, possibly making it unusable.

In your case, with it being flat work, you could lay up the backer to the substrate first and then apply the face veneer in a second pressing. Either way will work. For the most part I usually do two ply with just curved work.

Hope this helps.

Sincerely
Darryl Keil


 
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Don Stephan

Posts: 825

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

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Subject : RE: Tips, Tricks for Making Two Ply Veneer
Posted : 2004-02-14 1:15 PM
Post #31292 - In reply to #31291
Thanks for the very quick and helpful reply. Just to make sure I understand, in making the two ply sandwich of primary and backer veneer, tape the face or show side of the primary veneer with no-hole veneer tape, and the substrate side of the backer veneer with 3 hole, so that when the two ply sandwich is glued up there is no veneer tape inside. When the two ply sandwich is glued to the substrate, the 3 hole tape can remain on the backer because the "plethora" of holes allows sufficient gluing surface within the tape borders? Thanks and have a good weekend. Don


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: Tips, Tricks for Making Two Ply Veneer
Posted : 2004-02-14 3:36 PM
Post #31293 - In reply to #31292
Don,

Yes, you are seeing it correctly.

Sincerely
Darryl Keil


 
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Don Stephan

Posts: 825

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

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Subject : RE: Tips, Tricks for Making Two Ply Veneer
Posted : 2004-03-10 10:10 PM
Post #31361 - In reply to #31293
Another follow up. Finally made two 3' x 5' two ply's, flat cut cherry and backer mahogany. On the first one, I applied the Unibond to the cherry, and when removed from the press it wanted to curl dramatically across the width of the cherry. Made the two ply hard to work with. On the second one, I applied the Unibond to the mahogany. When removed, it wanted to curl across the mahogany, but only slightly. Is the Unibond always best applied to the shorter (along the grain) of the two plies? Thanks.


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: Tips, Tricks for Making Two Ply Veneer
Posted : 2004-03-12 9:23 PM
Post #31363 - In reply to #31361
Don,

I always apply the glue to the veneer that will be the backer. Sometimes it curls one way, sometimes the other and sometimes hardly at all. No matter what I keep it weighted under plywood until I use it, which I usually do right away.

Sincerely
Darryl Keil
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