I have tried several kinds of tape (kapton tape, generic electric tape, 3M clear waterproof repair tape), but the best so far is generic clear document film (known in Germany under the tesafilm moniker). I use a strip about 5mm wide to cover both middle contacts and to give it some area to cling to it is quite long. Starting directly at the ridge of the heart sensor to have no easy starting point for it to peel off and extending over the two contacts to the next ridge in the bangle case under the strap. Close to perfect since a few months and very easy and cheap to replace if it should fail. Tried nail polish and acrylic paint as well with very mediocre results. Be careful how you clean the watch before applying tape or paint, the ABS plastic really does not like acetone as found in some nail polish removers.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
I have tried several kinds of tape (kapton tape, generic electric tape, 3M clear waterproof repair tape), but the best so far is generic clear document film (known in Germany under the tesafilm moniker). I use a strip about 5mm wide to cover both middle contacts and to give it some area to cling to it is quite long. Starting directly at the ridge of the heart sensor to have no easy starting point for it to peel off and extending over the two contacts to the next ridge in the bangle case under the strap. Close to perfect since a few months and very easy and cheap to replace if it should fail. Tried nail polish and acrylic paint as well with very mediocre results. Be careful how you clean the watch before applying tape or paint, the ABS plastic really does not like acetone as found in some nail polish removers.