What is the best way to do this? I have a small space around the clutch and brake pedals and I'm trying to decide on the best way to seal it up. I was thinking about glueing down a piece of inner tube then spraying the rubberized under coating I have been using then laying the insulation on top of that. I'm just not sure how tight I can seal up the pedal...if I were to use a thicker piece of rubber like a grommet it might restrict the movement of the pedal so I'm not sure how to find that middle ground??

I'm on a mission to seal up the car. I have used seam sealer along the firewall and floor, but for around the pedals I am a bit stumped. Pictures would be great! Thanks