SHLD element is meant to be a kind of shielding for electronics, since it has the properties of INSL, and the pressure properties of Goo. In order to use it, you only need to have a pixel of SHLD touching any kind of metal while sparked, and the shield will spread across the wire with the spark, growing more the longer the spark goes.

The higher pressure goes, the deeper layers of shield disappear.

Nuclear explosions will essentially destroy shield, but generally not all at once due to the way pressure works. You'll have to mess with it.

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