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I am new to restoration and am working my way around my 1968 Mustang Coupe I bought on eBay. As I am going through it, I am finding this "stuff" between panels and joints. I took a sample to Autozone and they told me it was some sort of silicon, but I don't think so. I have found it between the wheel well and the truck bottom and on the cowling at the top of the firewall. It also appears to be on a lot of the joints. I have two questions. 1. Is this stuff original? and 2. If it is, what is it and where can I get some?