Veneer Bubbling - Woodworking Talk - Woodworkers Forum
 
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post #1 of 7 Old 06-27-2017, 03:36 PM Thread Starter
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Veneer Bubbling

Not sure what all information you might need to answer the question I have so I will start at the beginning. I started a project early this year (still winter) by applying a paperbacked ash veneer to both sides to a 3/4" Baltic birch plywood. I used contact cement rather than hide glue and applied at over the minimum suggested 45-50 degrees. Everything smoothed out and looked good at the time. Fast forward to now (June/July) and I got motivated to finish the project and now notice air pockets (bubbles) in the veneer in several places that were not there a month or more ago. I live in Florida. Is this a humidity issue? Use of contact cement? Other? How can I keep this from happening again?
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post #2 of 7 Old 06-27-2017, 10:25 PM
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May not have had good contact to start with. Spray or roll on glue? Usually the glue has to be applied twice and without a finish it have had time to move around with the seasons....

You can try a heat gun carefully to reheat and maybe it will soften it enough to restick where the bubbles are...
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post #3 of 7 Old 06-28-2017, 12:08 AM
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Contact cement is the reason for it bubbling. That type of cement is too rubbery for a paper back veneer. Had you use a formica backed veneer it would have been alright but you have a wood movement issue with the paper back veneer and the cement isn't strong enough to hold it.
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post #4 of 7 Old 06-28-2017, 09:18 AM Thread Starter
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Thank you for the replies. I had noticed it while applying that it didn't seem to have the "sheen" in areas and added a second or even third coat before placing the veneer on the plywood. Steve Neul, your reply brings up another question of whether what to use for non-paper backed veneer.
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post #5 of 7 Old 06-28-2017, 10:22 AM
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Here is a specialist site>

http://www.thewoodveneerhub.co.uk/wo...backed-veneer/

Good luck
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post #6 of 7 Old 06-28-2017, 10:56 AM
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Quote:
Originally Posted by Hsaimiri488 View Post
Thank you for the replies. I had noticed it while applying that it didn't seem to have the "sheen" in areas and added a second or even third coat before placing the veneer on the plywood. Steve Neul, your reply brings up another question of whether what to use for non-paper backed veneer.
The only way to have lasting good results with either a paper back veneer or a non-backed veneer with is to use a glue like hide or a resin glue. Once dry it pretty much becomes part of the substrate kind of like the layers in plywood. The manufacturers of contact cement only warranty the product for a year so it's pretty much considered a temporary adhesive. What has happened in your case is either the plywood shrunk a little or the veneer had swollen up a little and the contact cement let go creating the bubble. Had a more permanent adhesive been used it would take far more pressure for a problem like that to develop. With a formica backed veneer using contact cement will work because the entire sheet will give instead of spots. If the wood shrinks you will see the veneer extending out past the plywood as it won't shrink.
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post #7 of 7 Old 06-28-2017, 09:27 PM
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Contact cement may or may not be the cause of the bubbling..

I've use contact cement on veneers for years with good results. I do prefer wood on wood veneers over paper back...
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