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

Jim Kueneman said

Hard to hold the phone and run the scaler at the same time! I had this Valiant totally stripped of undercoating in a few hours.

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Wow Jim. I stand corrected then. If I ever do another one, I'll have to try your method. Does it remove the paint also or just the undercoating? Thanks.