I am looking for an item I will refer to as a hot knife(may not be correct) I need something that I can slice through rubber with ease numerous times. I have tried a sawzall and all it does is hook and vibrate the rubber, and its a lil on the thick side for a utility knife.

Thanks

 

For foam rubber use an electric carving knife.

 

something like this?

http://www.hotwiredirect.com/

or

http://www.demandfoamcutting.com/handheld.html

 

I second the electric knife, you know, the one you use on the turkey!
The blades move in the opposite direction of each other so you dont have to worry about holding the material. Works great and also works on material as thick as the blades are long!