Really. I didn't know that. I've never lived where one didn't vent to the outside. I used to melt my plastics on the kitchen stove when I first started out and lived in a duplex.
I'd get some paint stripper, clean then powder coat if I wanted to remove the paint. On mine, I just heat with a heat gun then recoat with powder paint over the old paint. I don't bake them but the paint lasts a long time.
I like my worms to be flat on the end so that they snug up to a sinker when I TX rig them so I cut mine off flat. That being said, if you want to round them out there are a couple of ways: heat the end with a candle or dip the end in hot plastisol.
A friend of mine invented a way to remove the second blade on a spinnerbait and easily replace it. He got a patent and sold it to John L. Morris. He said that he got $10,000 up front and $.01 for each spinnerbait made. I don't know how it is going as he got cancer and died.
I have a little touch up tube for my truck. When I stops working I take the end off and soak it in lacquer thinner. What is the base of the paint? You should be able to find a solvent that will clean it out without sticking something down it.
An infrared thermometer is what I use. When the plastic cools off I put it back in for 20 second bursts till it is ready to pour again. I don't add any stabilizer until I add the sprus and start remelting.
Mine is a $2 garage sale oven. I have used it for close to 20 years. I just learned where to set the dial to get a good bake and not scorch the paint. It took some trial and error.