Yesterday I used DAP water-based contact cement to attach a laminate
edge strip to one edge of a counter top that has a pine edge strip
(smooth but with no existing finish) already. The strip of laminate
already had a coating of that same contact cement that had dried long
ago, so I put an additional coat on that surface and also gave the pine
edge strip its first coat. After an hour or so, they bonded together
Later in the day I put a coating of the same contact cement on another
pin edge and on another strip of laminate. They will *not*
applied another coat of the contact cement to both surfaces, but they
still would not bond.
What could possibly be the problem here? The contact cement is less than
a year old and appears to be fine: it is still a milky liquid with a
solvent smell. But even if it were approaching the end of its
shelf life (one year), how come it worked on one strip and not on the other?