GE JVM1650 1000 Watts Microwave Oven "burnt taste food" Questions

Burnt bottom of large cast iron pot very discoloured and a certain taste seems to affect the food Hi, Most microwaves do not allow you to put metal pot or pan in side. If sparks are coming off of pots

...burnt popcorn makes in the microwave? If not do you know what type of paint that can be applied to the inside of the microwave? Uhhhmmm, paint? Inside a microwave? YUCK.... that would make food taste ...

...burnt as Plastic is crack and flaky around top inside edges. How dangerous is this to your health. Is this dangerous to health??? well im not a doctor , but I do know about metals a lot . rust is ...