Bondo/body-filler working time (On Topic actually)

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I tried using Bondo to make fillets and repair defects in some patterns
that I am making to cast.  For this kind of fussy fiddling, the Bondo
sets up much too fast (3-4 minutes).  Is there some way to increase the
pot life/working time?  If I use less hardener, will that slow it, or
just screw it up?  Is there something that I can add?

TIA,
Bob

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