Darryl Keil Last Activity 2025-09-09 11:09 AM
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Tom C.

Posts: 11

Joined: 2005-08-15
Location: Bakersfield CA

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Subject : Veneering on a plastic substrate
Posted : 2009-06-25 12:14 PM
Post #35570
I am planning in making a humidor with a flat top. To reduce the chance of warping, I am contemplating using 5/8” thick plastic as the core/substrate. Has anybody tried gluing veneer on thick plastic? What type of plastic? What type of glue? Any other suggestions to keep a lid flat with differential humidity would be greatly appreciated.


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: Veneering on a plastic substrate
Posted : 2009-06-25 1:34 PM
Post #35572 - In reply to #35570
Tom,

If you want to use a plastic core I would recommend expanded PVC. It can be worked like wood, cuts, joints and sands nicely. You can glue it with epoxy or polyurethane glues.

Here is a link to a source you can order it from, http://www.mcmaster.com/#expanded-pvc/=2h1blq

Darryl Keil


 
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Tom C.

Posts: 11

Joined: 2005-08-15
Location: Bakersfield CA

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Subject : RE: Veneering on a plastic substrate
Posted : 2009-07-11 11:04 AM
Post #35614 - In reply to #35572
I got the expanded PVC from McMaster-Carr. I scuffed with 80 grit and test glued some veneer with Gorilla Glue and West System epoxy. The GG popped right off and the epoxy was easily scraped off with a putty knife. Both tests were a clean failure at the glue/PVC boundary (no PVC taken off with the glue). I called McMaster-Carr and they are recommending 3M Scotch-Weld Contact Adhesives 30-NF (water based). So now we proceed to the debate about veneering with contact cement… What are your latest thoughts on that topic? I will be finishing with solvent based lacquer.
If I end up using contact cement, I would use that to glue on a base layer of veneer and the glue the final layer on top of that with UB 800.



 
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Don Stephan

Posts: 825

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

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Subject : RE: Veneering on a plastic substrate
Posted : 2009-06-26 6:20 PM
Post #35578 - In reply to #35570
Even if 1/2" or 3/4" thick, a piece of wood will moderate humidity changes within the humidor. A plastic substrate likely will not. Using plastic may change how the humidor functions.


 
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Tom C.

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Joined: 2005-08-15
Location: Bakersfield CA

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Subject : RE: Veneering on a plastic substrate
Posted : 2009-06-28 9:48 AM
Post #35580 - In reply to #35578
I will be using wood every where on the humidor except, possibly, the flat top. My concern is that an unconstrained flat top with a conventional wood or MDF core with veneer balanced on both sides might warp with a differential of humidity inside and outside of the box. That is why I am contemplating plastic as the substrate for the top only. If any body has any ideas on how to construct and maintain a flat top, I would love to hear them. I’m still in the thinking stage.


 
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Scott

Posts: 31

Joined: 2006-08-23
Location: New Hampshire

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Subject : RE: Veneering on a plastic substrate
Posted : 2009-06-29 12:46 PM
Post #35582 - In reply to #35580
How about AZEk, is that expanded PVC? Can you glue to AZEK? Also can you glue AZEK to itself? Would you still use expoxy or Polyurethane glue?
Scott


 
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Paul Kierstead

Posts: 39

Joined: 2008-01-24
Location: Ottawa, ON

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Subject : RE: Veneering on a plastic substrate
Posted : 2009-06-29 2:19 PM
Post #35584 - In reply to #35580
Humidor making is a well established craft. I am not sure how they traditionally make sure the top does not warp, but I would imagine it is like most wood items; make sure it has a frame of some kind and is not a slab.

I'd look over some good humidor work and see what they did to mitigate the problem.


 
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Tom C.

Posts: 11

Joined: 2005-08-15
Location: Bakersfield CA

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Subject : RE: Veneering on a plastic substrate
Posted : 2009-07-11 11:49 AM
Post #35615 - In reply to #35584

Point well taken. I have looked at many humidors and successfully built over a dozen with the conventional methods. This one is a commission where form has taken a priority over function and it has a flat top. The bottom of the top will have 1x1” strips that will nest and seal into the “box” portion below so, in a way, it will be framed. I think I can pull this off with conventional materials but I am looking for a “belt and suspenders” solution.
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