How do you paint behind a radiator?

Online Answer
When painting behind a radiator, cover the whole heater in a cheap cling film/plastic food wrapping before you start. If you have one of those rolls of plastic for packing boxes, then that is the perfect stuff but any clingy, film that just sticks to itself is good enough—so you don't have to tape it in place.
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Painting over mold will not kill mold or stop new mold from growing. According to the CDC, mold can cause nasal stuffiness, throat irritation, coughing or wheezing, eye irritation, skin irritation, and more severe reactions in immune-compromised people. Keep in mind that: Paint does not kill mold..