Soaping cooler will slow the reaction down. I think once gelling starts, it is very hard to stop. What is your recipe? Some oils, like coconut, are fast tracers and fast gellers. I guess they react more quickly to the lye than some other oils (lard for example). Same with FOs and EOs. Some cause seizing, which I think is just the normal lye reaction sped up.
What are your molds made of? A wooden mold is going to hold heat and encourage gel.
Somebody mentioned that a fridge or freezer might not be effective because you are relying on cold air to cool it down and cool air isn't very dense and won't cool the soap quickly. At least that's my understanding.
I would get a cooler that will comfortable hold your mold, then make ice packs. I believe my mom's recipe is 4 parts water, 1 part rubbing alcohol. This will make a soft, mushy "ice" that is flexible yet is very cold and STAYS very cold. Be aware that it will take them a while (a day or so, I think) to freeze. Double bag them - the alcohol will eventually eat through the plastic. My mom mixes the two at room temp, puts them in a seal-a-meal bag and puts that in a gallon freezer Ziploc bag.
When you make the soap, I think you will at least want a bag on top of the mold and a bag underneath.
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