I made pressure sensors using sponge-filled craft stars, velostat, copper tape, wires, leds, coin batteries, solder, and three different types of conductive material (copper taffeta [.05 ohms/sq], metallized nylon [< .02 ohms/sq], and copper tape over paper [.05 ohms/sq]). Before making the stars, I tried those three materials and liquid graphite, pure graphite pencil, bare conductive paint, and the electroinks conductive pen. I couldn’t get it to work with the pencil, paint, or graphite. They were too resistive for the velostat. The conductive pen worked, but it would have needed a much thicker layer to be reliable. Based on the resistance levels, I assumed the taffeta and copper tape would yield the same results, and the nylon would shine brighter. I found the nylon to be the worst, which makes no sense to non-math comprehending brain.