Gutting Sprague cans

[Jon A.]

Yup it must be tar, it's as tough as nails. The wafer is the same thickness you mentioned, and there was a layer of plastic film between the phenolic material and the decayed rubber.

Aw, screw it... I'll probably just mock up new cans from stainless steel pipe and end caps. I hadn't thought of that before. My goal is a high-grade restomod; I don't feel a need to make things look totally original.