I remember this toy we had in the 60’s that you poured a liquid plastic into a mold and then heated in a small heater which would make worms and bugs. You could make rubber cockroaches, centipedes and other bugs. We once left it plugged in and almost burned down the house.
Then we had a soldering gum like Stick you’d plug in and could burn words and pictures into a piece of wood. Left that plugged in a few times and we only would realize it cause the heat would cause something to melt and/or start smoldering and we’d smell the stink.
Creepy crawlers, that is it!
I used to really love playing with mine. Mom kept having to buy me more Plasticgoop.