Not sure if you are using soft or Borro that you are preheating but considering the kiln temperature is around 960 for soft and 1050 for Borro I don't think a hot plate or crockpot will got the rods hot enough to preheat effectively. Most kilns have bead doors that you can preheat with. There are also rod warmers that look like curling iron warmers but get much hotter. Also remember when using a crockpot to anneal beads they go in hot and the warm insulation slows the rate they cool.
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