I need to clarify my original question.
As well as high spots I am also trying to determine the distribution of the clamping force between the two components - this is where the pressure sensitive paper comes into play as it reveals more than 'blue'.
Thanks for comment anyway.
I am trying to source some pressure sensitive paper that I can sandwich between two mating flat component surfaces & identify any high spots. Any high spots will show themselves as black markings on the white paper, the denser the marking the greater the high spot. Any ideas ?
