Darryl Keil
Posts: 1455
Joined: 2003-05-22
Location: Maine
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Scott,
I understand your reason for adding thickener meant for epoxy to Unibond 800 and up to a point its probably OK. We dont really have the time to thoroughly test possible additive variations to Unibond 800. Before I would put our official stamp of approval to something like what you are doing we would do some pretty exhaustive testing first. An unofficial answer would be, a little bit would probably be acceptable. How much could you add before the glue line begins to be compromised, 1, 2, 5, 10 percent? I cant really say.
Although both Unibond 800 and epoxy are true catalytic glue which achieve their final cure by chemical reaction, there is a important difference between the two. Epoxy is what I call a structural bond, meaning you could literally float two pieces of wood in a bed of epoxy and get a good bond. Not so with Unibond 800. Unibond 800 requires good intimate contact between both surfaces being glued and does not have the level of gap filling ability that epoxy does. This is why epoxy can handle the quantity of thickener that Unibond 800 cant. With that said Unibond 800 does have some gap filling ability up to a point.
So in conclusion I just recommend you do some simple testing. If your tests give you positive results then I would say your fine to go forward as long as you dont exceed the percentage of thickener you tested for.
Sincerely
Darryl Keil
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