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I’m sure there are chemicals that will dissolve it - but not anything you want to be around.
Scrape as much off as you can then remove hardened stuff mechanically.
There’s a sweet spot when the 2-part has hardened but not cured and it sometimes comes off in one slightly rubbery piece.
Quite satisfying.Once you’ve sanded metal tools you’ve provided a perfect key to which subsequent filler will adhere.
It’s a bummer.
Two part wood filler. How do you clean that bastard stuff off? White spirit wouldn't even touch it. Ended up attacking the filling knives with the RO sander, and that was after making sure to scrape as much off as possible before it cured.