Polyurethane woodworking glue?

"Parallax" wrote in message
om...
After inspecting my visqueen sails on my minicups, I find they are
coming apart because the double stick fiberglas reinforced carpet tape
I used to hold them together is failing. I am fairly sure this is due
to prolonged exposure to water int he rain here as I simply do not
have room enough inside for them so they stay mostly under a tarp.
However, before I spend time re-doing them, I plan to do some
experiments with adhesives using some scrap visqueen.

First, I have assembled a short section in the manner described in the
directions with duct tape on either side and holes through which the
duct tape adheres to itself.

Second, I assembled another using the carpet tape.

Third, I assembled another using 3M Super 77 spray adhesive

Fourth, I assembled another by "melt adhesion" using my large 250 watt
soldering iron.

Fifth, I assembled another using Contact Cement.

Sixth, I assembled another using a bead of 3M 5200 adhesive.

I plan to let all of them cure and then run them repeatedly through my
wifes washer till they fail.

First impressions:

The duct tape version really does not seem to be too strong and could
be easily separated.

The carpet tape one is stronger.

The melt adhesion is good but thee is a very fine line between
achieving good adhesion and melting holes all the way through. It has
promise but need more work.

Any ideas?