How to make a waterproof membrane switch? To create a waterproof membrane switch, follow these steps: Material Selection: Choose waterproof materials, like polyimide or silicone, for the membrane and overlay. These materials should resist moisture and chemicals. Sealed Design: Ensure that the edges of the membrane are properly sealed. Use adhesives or gaskets to create a tight seal that prevents water from entering. Conformal Coating: Apply a conformal coating to the circuit traces and component