This is related to this question:
Can I accelerate caulk drying by using a fan or heater on it?
…but that question kind of veered off into talking mostly about silicone caulks.
I'm trying to caulk parts of a deck I just built (namely around the railing posts). It's wet and cold (pacific northwest) and the silicone caulk I initially used never set after 3 days. So I thought I'd tray an acrylic based one (DAP Dynaflex 230). Can I speed up the cure time on this with some technique? Perhaps heat? I can't find any definitive answer as to whether heat helps acrylic caulk cure faster. I can only find references that heat does not help silicone caulk and actually is a way to remove silicone caulk.
Best Answer
Well, DAP Dynaflex 230 is a great caulk, but like all other acrylic caulks that I used, they specifically state that curing time is longer in cool or humid conditions.
See their TDB:
So yeah, if you're applying it in cold and wet weather, it will take longer to cure, so moderate heat might help (application temperature is up to 100F/38C, don't just bring a heat gun to it), as well as shielding it from elements.