Check the continuity of the paint to your electrodes. If you can trigger the Touch Board touching the electrode directly, but not at the painted touch pad you have made, there is likely a break somewhere. You can try re-painting your touch pad or testing it with a multimeter.
If you want to test the connection with a multi meter, set your multimeter to measure resistance and with one probe on the electrode you are trying to trigger, gradually move along the painted trace or wire with the other electrode, measuring the resistance wherever you can. It should be up to a few hundred kΩ – if it shows infinite, you have lost connection. At the point where measurements change from kΩ to infinite, try touching up the trace with some more Electric Paint or checking the wiring to ensure continuity.