Glue Lines in Veneer
The veneer manufacturer should detect and eliminate glue lines; at the finishing stage, they are hard to deal with. March 26, 2010
We are having issues with glue lines in our veneer from our vendor. We can not seem to eliminate the lines, even after sanding with a good panel sander. Since we are using a waterbased finish, will we be more prone to lines that would have been covered up by solvent based finishes? Is there a good way to detect these lines? We thought we had eliminated the seams after sanding - you can't see them before finishing, but then after the second coat they appear, causing a very large headache.
From Jeff Pitcher, forum technical advisor:
You should talk to your vendor about their splicing process. Very often, veneer splicers use too much splicing adhesive when making faces, which results in a thick (visible) glue line. You also might want to check the MC of your veneer. If it's over 10%, this could be adding to your problems.
From contributor R:
This is an age old problem that has to be controlled on the supplier side. Your supplier should add a florescent dye to the glue. Wherever there is glue it will show up under black lighting and the supplier should sand it off. It is nearly impossible to see without this light and by the time you add a finish, it is too late.
From contributor B:
I had the same glue line problems with a line of unfinished conference tables that I import from China. I was able to easily spot them before finishing by turning off the overhead lights and lighting the table with two 500w quartz work lights placed at a maximum oblique angle. The next step is to find another supplier.
Would you like to add information to this article?
Interested in writing or submitting an article?
Have a question about this article?
Have you reviewed the related Knowledge Base areas below?
KnowledgeBase: Knowledge Base
KnowledgeBase: Adhesives, Gluing and Laminating
KnowledgeBase: Finishing: General Wood Finishing
All rights reserved. No part of this publication may be reproduced in
any manner without permission of the Editor.
Review WOODWEB's Copyright Policy.
The editors, writers, and staff at WOODWEB try to promote safe practices.
What is safe for one woodworker under certain conditions may not be safe
for others in different circumstances. Readers should undertake the use
of materials and methods discussed at WOODWEB after considerate evaluation,
and at their own risk.
335 Bedell Road
Montrose, PA 18801
Copyright © 1996-2013 - WOODWEB ® Inc.