
It's not exactly the desired effect but close enough. Using a heat gun and moving it up and down, back and forth, to make sure that the plastic simply doesn't curl up, the plastic takes the shape of the keys. However, it does not melt into the keys. Curiously, the keys underneath start to melt as the plastic molds to the keys, sometimes melting through but not melting into.

There will plenty of time over the winter months to work with and perfect this effect.
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A typical backlit keyboard. |
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Another version of a backlit keyboard. |