Time before demolding epoxy resin? When is the best time to demold a resin project? Even though each project is different, we recommend waiting at least 7 days before demolding your epoxy project. Especially with slow-setting epoxy. Working with a casting system with an extended pot life means it will take longer for the epoxy to close its molecular chain. The resin needs to reach maximum hardness before taking it out of the form. If the epoxy is still curing when demolded, the epoxy can bend, sag or even delaminate under stress.
Of course, fast-setting epoxy will cure faster than casting systems. Waiting 7 days is actually a precaution in case something has disturbed or slow down the curing process. Colder temperature is a good example. If you poured your project under 72F/22C the epoxy will take longer to fully cure. Another factor that slowdown the curing and demolding process is pouring under the recommended thickness. For example, if a casting system like CHILL ICE 2 (2:1) which is meant for a full 2″ thick pour is poured at 1.5″ or less. The lack of energy will affect the epoxy resin which will take longer to fully cure.
Time before demolding epoxy resin?
We recommend letting the epoxy cure for 7 days at 22°C/72F.
Especially with our CHILL ICE 2 and CHILL DEEP POUR, both 2 slow setting epoxy meant for bigger project. Demolding before the cure will result in flexible/bending epoxy. If you had one of few of these situations, after 7 days, the curing process wasn’t totally reached and the molecular links weren’t totally closed so the project sagged.
Testing the Hardness as an Indicator
Another way to see if the epoxy has reached its final cure is using a durometer which will indicate the hardness of the resin. Because we know our CHILL EPOXY products will reach a specific hardness ( SEE TDS) you can verify the hardness of your pour on a daily basis and demold only when it reaches its final hardness.