Of course it's been done before for years, there are several threads that talk about it.
While it can be used, it's not as Efficient as it could be and doesn't evenly heat the ball surface when just pointed at the ball which can be a problem.
Most typical DIY will place a ball in a box with the hair dryer mounted in a hole in the box in such a way as it doesn't blow directly on the ball, this is so the heat is trapped inside and circulates around the ball more evenly.
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