Tar-like undercoating on 63 Valiant...any way to remove it?

Make sure and wear PPE, I also have a 63 valiant and someone told me years ago to be careful because a lot of 64 and back cars had asbestos in the undercoating for insulation properties.

As far as I know by the late 60s the rubberized stuff replaced the asbestos stuff.

I'm pretty sure that was in an old thread here on fabo when I bought my 63 valiant wagon, maybe a decade ago.

Even without the asbestos, PPE is always a good idea