Andy Pitts
Posts: 2
Joined: 2011-11-22
Location: Heathsville, VA
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Hi, I've been using Unibond 800 for some years, mainly for bent laminations. I recently used it to reglue two 6/4 soft maple planks, each cut sequentially from the same cant for drying, together face-to-face to make up a thicker plank for a fireplace mantle (see my YouTube video at his link, or channel AndyPitts1000 for more info: http://youtu.be/A81nOZe7gHU). All is fine, but today I gave a shop tour to a very experienced boat builder and he asked if the Unibond would "give" enough to allow the glueup to move seasonally, particularly since the plank would be a fireplace mantle where there is extreme drying in winter (the house is in Virginia and is air conditioned in summer, btw). I explained that the planks were essentially the same thick plank that had been milled in half, dried, then reglued so that all grain was going the same direction. He said he understood, but asked if the thin film of Unibond between the planks would fail, since Unibond does not allow creep, when the assembly changed dimension seasonally. It would be as though the Unibond was a stable center ply, trying to hold two thick planks from growing and shrinking. He said he had seen similar failures with epoxy in the boat industry. Hmmmm...I've never had a failure on panels I've made, nor on bent laminations, but I thought I'd ask if anyone has seen failures in this mode with very thick planks. Thanks, Andy.
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