Previously, I asked this question but got no replay ( 10/1). I’d still like to know.
In the glue article in the April, 2005 issue, the article clearly stated to apply urea formaldehyde glue to only one side when laying up laminations.
Why only one side?
Gary
Replies
when doing a glue lamination as is pictured in the article it is not necessary to coat both sides of each lam. You start out with one lam, coat the upper face with glue, place the next lam on top, coat with glue, place the next lam on top of that and so on and so on...don't put glue on the top of the last lam- that is the outside!!!- you don't need to spread glue on each mating surface because as soon as you put the two laminations together there is now glue all over both mating surfaces!
The same idea holds when you are glueing a butt joint (like for a panel or a table top) why put glue on both edges to be joined? as soon as you put them together there will be glue on both edges!
Does that make sense?
Hope so
Bob Van Dyke
What you say makes sense but I thought one had to be sure to wet both surfaces. Also, I thought the PVA glue containers said to be sure to wet both sides. I had always wondered if that was just so I'd use more glue.
Thanks,
Gary
Soon as you stick then together there is glue on both surfaces! why use more? you just end up squeezing it out all over the place- then you have to clean up that mess.
Bob Van Dyke
"Also, I thought the PVA glue containers said to be sure to wet both sides. I had always wondered if that was just so I'd use more glue."
I think it's more about ensuring a good glue joint. With most glues, you want to be sure that both sides of the joint are thoroughly wetted with glue. The easiest way to do that is to apply glue to both sides, because you can just look at it to verify that you haven't missed any spots. But if the layer of glue on one side of the joint is thick enough and distributed evenly enough, then the other side is going to be wetted as soon as you put them together. Which brings us to the other easy way to ensure that both sides are wetted: Apply glue to one side, put the pieces together, take them apart, verify that the formerly "dry" side is now thoroughly wetted with glue, put them back together again.
-Steve
Thank you.
Gary
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