Back in my dealership days we often used it to tack gaskets in place during assembly and it worked perfectly even though that's an "off label" use. Stuff like cork valve cover gaskets and the like can squirm out of place pretty easily and we'd stick 'em and let the glue set as/per the label and it solved that issue. A trick we picked up was to use the hold-down bolts to align the bolt holes as the glue set and then everything fit just like it was made for the application (which of course it was but otherwise it's hard to have the holes aligned).

Only glue 1 side or it'll be a stinker to ever remove that gasket again! We always did the side that would come off in your hand so we could wire brush the remains off if we ever had to pull the part again. So the valve cover gasket was glued to the valve cover, the thermostat gasket was glued to the water outlet neck, etc.

So you have a use for any that's left after you install your weatherstrip.

Dan