Velostat changes resistance only on press wirh my finger?

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AdmiralCrunch

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Hi,

I want to create a button-pad and therefor I have got me some of this Velostat.

In first experiments, simply two wires with a slice if velostat as a bridge/switch over it, worked fine.. but I pressed with my finger on it.. now I want to have the same behaviour unterneath my silicone-button-pad .. so I glued a piece of the Velostat unter the a button and now, nothing happens .. oO (?) .. why is that? should it matter what presses the Velostat?
 
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