Although I have not tried it, I know my crock pot goes up to at least 190 degrees. Melt and pour should be a liquid before that. I think I saw a youtube video where a woman would turn the crockpot on the night before to be sure it was ready to pour in the morning. I shall stick to my microwave though. Saves energy.
Realized it'd be harder to ladle the soap out of the crockpot than it would be to just pop a measuring cup in the microwave so scratched the idea. Now, if they made a crock with a built in spigot........hrmmmmm
My daughter will use a crock pot at times when her Primo Wax Melters are busy. At times she will want a batch of one color and use the crock pot on low to keep her colored base melted. I know she does not turn on the crock pot the night before only the melters go on the night before. She only does m&p or did and could load up her melter with 25#'s of base.