Hi Darrall,
I use Woodland Scenics Hob-E-Tak, which I believe is similar to canopy glue. Hob-E-Tak is great for tacking resin kit parts in position before adding CA, and it will hold parts together if they are not exposed to bumping and handling. I used it throughout my constriction of an F&C NP 36ft boxcar, and it made alignment of parts much easier. Two other examples: I used it to glue a styrene toolbox on the pilot deck of a P2K USRA 0-8-0 that I detailed for someone else. The toolbox had to be removable in order to disassemble the loco to maintain lights, etc. I also used it to secure cab awnings to a P2K USRA 0-6-0. The awnings had attachment pins, but they did not keep the awnings on the cab. Only one of the Hob-E-Tak'd awnings has come off, and it was easily re-attached without more glue.
I hope this helps.
Todd Sullivan.