I'm cleaning up the yoke mount today and noticed that there is some black paint looking stuff under and aft of the rubber bumpers for the CRT. I thought it just might be some black paint at first. Then I thought why would they paint that area black? It doesn't make sense.
Then when cleaning it off, it seemed to be almost rubbery? Then I remembered that when full sized airplane have rubber deice boots installed, we used to apply a small amount of black conductive paint to the boot and overlap on to the aluminum. This was used to conduct the static electricity built up on the rubber boot during flight to the airframe where it can be disapated off the airframe through the static wick dischargers.
Do you think that what this stuff is?
Here are 2 pictures showing what I mean:
