Leave factory under coating alone or replace it ?

I wouldn't use aircraft stripper on undercoating unless you want to remove the paint as well? If you are CAREFUL a propane torch and wire brush will remove it without hurting the paint. All you're looking for is to soften the undercoating and then brush it away. It's a messy , stinky , dirty job best done outside or with a lot of ventilation. I just did the underside of my 68 Barracuda last week end here's the results.

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