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Russell
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: I just can't seem to get urea formaldehyde glue to work. I'm using : glue from CP adhesives, sold as veneering glue, mixing up the proper : proportions by postal scale, applying what I think is the proper : amount of glue, currently trying to veneer some sample pieces of : makore and sapale onto scraps of 3/4 inch MDF. Admittedly, my shop : temperature isn't the minimum 70 degrees recommended by the : manufacturer. I am placing an electric heating pad and blankets over : the piece, which I am sure raises the temperature adequately. The : glue seems to set up well, but I'm getting very poor adhesion between : veneer and substrate, to the point where I can easily peel off or : delaminate pieces of veneer from the substrate 24 hours after glue-: up. In addition, the glue sample in the baggie does not set up the : way it should. Even when I bring it indoors (68 degrees), 12 hours : later it is still free flowing liquid. I went through the same : experience last summer, when the ambient temperatures were higher. Is : this the glue? Is this sort of glue so exquistely temperature : sensitive that 68 degrees instead of 70 just won't do? Why the poor : adhesion-- another temperature characteristic? Can I expect Unibond : to act differently?My shop is not the perfect area (30ft. cieling) for climate control, so I tent- a quality tarp over my vacuum table so it drapes to the floor. I use a small halogen light to heat the underside of the table/tarp. substrates if cold ( 65 or lower) they are set in the tent to warm overnight before glueing, then removed, glued, and placed in vacuum, i then also lay an electric blanket on top of the bag, and re-drape with the tarp. i press for a minimum of 3 hours, but usually leave it overnight.
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