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

B-i-n-g-o said
Started pulling the old fuel line, and, as I worked my way forward, realized the whole underside is coated in a dry tar-like material. This 1963 dealer rustproofing, a 70s JC Whitney thing, or what?

Any way to get it at least mostly off without blowing the car apart? I fear it'd turn into another unfinished project if I did that.

Thanks,
Steve

Few options... mostly involving scraping... I had success with my 64 using a heat gun (carefully) and a multipurpose tool with flexible scraping attachment along with a putty knife and wire wheel. It was messy and took a lot of time.

I tried the oven cleaner and other liquid/ chemical approaches and at least for me they did not work at all... Others have had success.

Good luck