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Unfortunately your setup is not going to work. -first off, all usb gives out 5V, not 12V. Unless it is usb pd, wich can go up to 20V I think, but this needs a digital feedback from the power consumer, so no plug and play. - secondly, usb only goes up to 3A, again, without negotiation with the power source. So you only get 15W out of a usb, without some sort of electronical device. -the temperature switch will not wot work either. -your electrical abilitys don't seem to me, that you should build a electrical heating device, and leave it unattended for hours.
If it is only for keeping it warm for some hours, a hot Water Bottle will suit your needs.
But if the resin doesn't cure during several days of 10h (or as long as you are at home) room temperature, there might be something wrong with your mixing ratio, anyways. Over one night at room temperature most resins will harden dry to the touch.
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