Stuff on inside of door panels?

[Schumi]

I'm stripping down some door panels for our race car, and cut out the inner sheetmetal to make room for closing around the roll cage. I then noticed there is this stuff on the inside of the outer panel- looks like some sprayed on sound deadening material. It is factory-done. I took a scraperd to it and it comes off exposing it to be a silver/gray-colored hard paste.

I haven't seen sound damping material like this before. The color and density got me thinking- this isn't some sort of lead-based material is it? Just wondering, for my health's sake when removing it...

[Nostril Cheese]

It's probably asbestos.

[Griffinroydonal]

I removed the same thing while rebuilding a few doors. Heat gun worked great and a large putty knife. I don't even want to guess what that stuff is made of and wore protetion just to be sure.