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I used it on a car in 2020 and 2021 and I didn't really have much experience with it, but imo it did take longer than expected to get hard. One thing I found really helpful is thinning it with acetone, it made it easier to work with/knife down, and maybe helped it cure faster, too. In the end I usually just accepted it sanded kinda mediocre and would do my final pass with glazing putty to fill in the sanding scratches. Thought it was just me, but maybe it wasn't. I really like the Bondo red glazing putty, though, it's awesome stuff.

I think for interior use perhaps instead of Bondo you could switch to Durham's Rock Hard Putty. Exterior it does fail, though, and it's very brittle and has almost no flex. Still, water mix to as thick or thin as you want and no fumes, I'd rather use it any day of the week over Bondo indoors. However, I do think it does flash without being primed, unlike say, Elmer's Wood Filler.
 
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