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Joe - I am just a little familiar with Borax. I know that it is used to treat for powder post beetles. I'm not sure how long the Borax protection would last. Try checking out www.woodweb.com, they have a lot of good info on there. The "sawing and drying" forum would be a good place to post a question about Borax. The moderator for that section of the forum answers a lot of the posts and he is excellent.
Brad
Joe,
I came back to this post reviewing some other sign mounting posts.
Did you have a final outcome of this problem? I have used 6mm Dibond
as a backer without this warping. Heat in your area vs. cooler temperatures here?
Ron,
Thanks for your interest.
We removed the sign and was luck to be able to pry the Dibond of the back with little damage to the original panel. A new 1/2" sheet of Duna 18lb was epoxied to the back. I made sure the sign was laying flat during the glue up.
I then glued attached the 2"X3" stringers to the back are re-installed. She's flat to the world now and I'll not glue up materials with different expansion rates.
Joe
Joe,
Good to hear of the success. That Duna is great stuff.