Fantastic glue, I use it to bond balsa leading and trailing edge to my custom cut foam core wings. Best adhesion when you apply a smooth bead to one side, make contact then pull apart then re-attach . Instant bond which is permanent after glue has cured. Cannot pull apart without breaking the balsa and foam. Never had a glue failure yet. Been using this glue for approximately 4 years. These wings are also subjected to moisture because the wings are built for water-based RC airplanes, meaning they can only fly off and land on water.
The knife works exactly as described... where has this thing been all my life? in addition, my interaction with Customer Service prior to choosing the right product to suit my needs was very pleasant and the communication was timely. I suspect I'll be buying more from Hot Wire Foam Factory and projects come up and budget allows.