[Turk]

Since it is contact cement and requires application on both surfaces, it needs to be allowed to dry to tacky before joining the two surfaces together.

When one surface is pourous like carpet or insulation is, apply it to that surface first. Let it dry. That seaals the pourous surface so it won't keep on absorbing the glue.

Then apply glue to both surfaces, let it dry to tacky. Join them.. It ain't going nowhere!

TURK