Best heat insulation?

I was reading an old technical manual the other day, it said to insulate from heat, make a paste from asbestos and water. Also, if you're out of powdered sugar, it makes a great substitute for waffles. :lol:
I wouldn't mine the asboestos and water paste as is would be contained, but not if my boy would restore the car some day. Don't need that ground or sand blasted out. That is great idea for waffles though!