The problem is a dumb gimmick in general, I doubt lots of fans or kids would think that gimmick is interesting at all. Maybe if he ditched the glue, or made a minor part of his inventory, instead of the main focus. I mean did you have a problem with the way calculator switched gimmicks?
Another problem is he has no motive, look at this bio:
http://www.geocities.com/marvel_oops/trapster/trapster.html
That's why he is in the loser section of that site.
For smart guy he is pretty well written as an idiot almost all the time: one he started his criminal career instead of patenting this glue, two he got pardon for helping to foil Zemo's scheme and he still decided being a criminal was a good idea, three when Sandman was reformed he gave Trapster a chance to reofrm and work for the Wild Pack, but he decided to blow it by robbing a jewelry store and Four despite the fact that Wizard tried to kill him, he is still willing to hang out with him. For a supposed smart person, he does stupid things all the time. A smart person learns from his mistakes, a stupid person makes the same mistakes over and over again.
Dr. Octopus learns from his mistakes and tries to adapt his tactics, Rhino makes the same mistakes over and over again. Who does Trapster sound like? Seriously if want Trapster to be taken seriously you have write him as being smart and come with a reason why he scorned all those chances to turn his failed around, because at this point Trapster isn't scary or symapthetic, he is just pathetic.