When the "quick-drying" epoxy glue is blown off of Batman's left wrist, you can tell it is merely a rather flimsy saran wrap which isn't solid or even liquid at all.
We learn here that Commissioner Gordon is right-handed, as is evidenced by the fact that False Face was holding a hankerchief in his left hand while disguised as Commissioner Gordon, which Batman was able to identify presumably through memory.
During the scene at The Bioscope Movie studios in which Chief O'Hara drives up to The False Inflatable Batmobile, look carefully in the rearview mirror. You can see cameraman Howard Schwartz in the car's back seat!