<VV> VV Cold draft above kick panels

[john]

I have discovered a very cold draft running down the road rising out of the upper portion of the kick panels on a late model I have been driving to work. Upon removing the panels I found none of the usual white sticky putty that is normally around the vent. I am not sure if this stuff is still available and the parts store guy just gives me the "deer in the headlights" look (probably thinking...the wierd corvair guy looking for something no body else ever needs....)
  I have used plastic modeling clay (yeah...raiding the kids toybox, again) before in a pinch but was wondering if there is a reasonable substitute anywhere to be found. This is last dumb question I will ask this week.....promise!

John Miller
Iowa