Hi All, This is an opinion. I received samples of Roo Glue's Roo
Clear, National Casein's replacement for PVC-E glue (#4508), and
I made three identical striker bellows and covered them with Schaff's
nylon pneumatic cloth. I also made a fourth bellow and glued the cloth
with PVC-E glue. Then I pressure tested the bellows starting at 5 psi
of compressed air.
I found Spectrum's glue had the strongest bond. The cloth popped off
one side at 8 psi. I have been using Spectrum's glue since then for
other bellows work and am quite pleased with the results.
John A Tuttle
Brick, New Jersey, USA