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What's the gray tacky stuff in heater box joints?

3K views 8 replies 5 participants last post by  Aussiemerc 
#1 ·
Yep, I'm still inside the 380SL heater box. I noticed when cleaning out the junk that all the joining slots seem to have a gray tacky substance in them. It looks like Blue Tac - a kids soft goo they use for sticking things but never sets hard.
I'm just about ready to put it all back together and wondered what I should be using in the joints between the 4 major parts of the heater box. Maybe I answered my own question?
 
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