I think that is what made the regular--solvent base ?-- contact cement start
to dissolve the vinyl.
I needed to position the material before the contact cement was "ready" so I
could move if necessary. Therefore some of the solvent was still present to
attack the vinyl.
With the water based cement, this didn't cause a problem.

"Dennis Pogson" wrote in message
...
Snip

You really need to be able to move the material once you have laid it on
to
the plywood, to remove bubbles and re-position for bad alignment.

Contact adhesives make this quite difficult, even the ones which claim to
be
slow-curing.

Dennis.