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Sorry I wasn't clear. The instructions from the soap ladies was to nuke for 8-10 seconds, check it. Nuke again for 8-10 seconds check it again, etc and keep going until its melted. Just what I...

I agree that soaking the soap for that long might be the reason. Also, I've seen soapmakers suggested nuking the soap for no more than 10 seconds at a time. Could 40 seconds be too much at once?
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