How do you paint behind a radiator without taking it off?

Online Answer
To create a professional finish, paint or wallpaper should be put on the wall behind the radiators, pipes and other obstructions, but it's not that easy to do well using the conventional paintbrushes or rollers. By using a paintbrush or small roller to paint the wall behind the radiator this only covers a limited area.
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Radiator paint is readily available from hardware shops and the easiest option is to use spray paint. The finish is just as effective as traditional paint and can be done while leaving your radiator attached to the wall. Spray painting your radiators takes only a few minutes but does require a bit of preparation.
What Does the Dentist Paint on My Teeth During a Checkup? Sometimes during a routine checkup and cleaning at the dentist you get something painted onto your teeth. It is applied with a tiny brush, and hardens as it comes into contact with your saliva. The whole process takes about two minutes.
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.
To complete the refresh to a professional standard, you need to make sure that paint is applied behind any radiators or pipes that are in the room. These areas can be awkward, but without finishing them off well, you will be dissatisfied with your work.
The first professional option is commonly referred to as "in-office" whitening. This procedure is performed in a dental office. An in-office whitening treatment may include the use of a whitening lamp or laser to enhance the effectiveness of the whitening gel by accelerating the peroxide..