I suspect that some of us will use the sensor outdoor. Please consider coating the board with exception the read circle area. Please coat as last process. With coats, you will loose conductivity to the the pads. If you make a mistake, it will be a hassle to scrape the coat to get access to the pads. As note, please do the coating until last steps after all has been tested.
Some of us have access to what is called “conformal coating”. This is the proper way to go.
But, if you cannot get access to this coating, you can use nail polish as a Youtuber found something interesting property about the nail polish.
