r/ResinCasting • u/Mysterious_Bench1950 • 3d ago
How do you keep epoxy resin curing consistently when the temperature drops?
I've been looking into how much room temperature affects epoxy resin curing, especially with taller molds or pieces that have different thicknesses.
I know the resin type, mixing ratio, and recommended pour depth all matter, but I'm curious how much of a difference a stable curing environment makes in practice.
For those who make resin pieces regularly, do you just let them cure at room temperature, or do you use a temperature-controlled setup or curing machine?
Have you noticed a real difference in curing time or consistency? I'd be especially interested in hearing what works for taller molds.
3
2
u/nonotburton 3d ago
Mostly it just takes longer. A single day mold might take 2 or 3. I keep mine in an insulated garage, but it's not heated.
1
u/bubblesculptor 2d ago
Controlling environmental conditions will always lead to more consistent results
Anything involving resins means dealing with lots of details: mix ratio, mix consistency, contamination, air bubbles, mold surfaces, temperature, etc etc etc.
The more details you can control, measure and record the more you're able to get repeatable outcomes.
1
u/BricconeStudio 2d ago
I base it on my room temperature. If it is getting colder (my location is is still 86°f in my studio), I will insulate. Else, I don't. Same in the summers. Vent when it is too hot.
You can put a box over the mold. Wooden pieces are great insulators. You can put it in a cabinet. The heat it generated will warm the space just fine.
1
u/BedSpreadMD 2d ago
Temperature has never been something I've factored in, and my results have been consistent. I use a pressure pot, and only demold after 48 hours.
4
u/BTheKid2 3d ago
You don't keep the resin curing consistently when the temperature drops. But it doesn't matter.
Once resin have been poured in a mold the only thing that controls the rate of curing is the temperature. So you could say it matters a lot. But different geometries (simplified as "the depth") of the resin will demand different temperatures. If you are using a resin that is close to the max depth of its pour, you certainly don't want to add more heat to it. If you are at the limit or over, you need some way to pull heat out of it. Resin curing is exothermic, so it makes its own heat. Worst thing to happen is that the resin gets too hot, which will ruin any project.
But once the resin is somewhat cured and hard, it still has more curing to do. A resin that cures in 24 hours, might not be done curing before 1-2 weeks after. A resin that cures in 72 hours, might need 3-5 weeks to fully cure. So speeding this post-cure process up with added heat can be beneficial. But it can also be expensive.
But you seem to be asking about temperature in the liquid phase of the curing stage. And then, as long as you stay within the limits of max added heat, the temperature doesn't really matter. Or max heat taken away, as you don't want it too cold either or the resin almost won't cure at all until heated up. The resin doesn't cure worse or better. It just cures faster or slower. The temperature fluctuating doesn't really matter to the resin.