I’ve got a project in mind that requires a membrane keypad, rather than something like acrylic, because it needs to be somewhat water and dust resistant. Oh, and it has to allow for backlighting of the keys.
I’ve read about the following technique:
- Cast the keypad in transparent silicone rubber mold
- use a dark grey or black oil-based opaque paint to cover the casting
- laser off the opaque paint in order to reveal the keycaps in the transparent silicone rubber underneath
- coat the keycaps in a matte or gloss clear polyurethane to lock in the opaque paint and prevent it from flaking off the silicone
Has anyone had experience in painting and locking in silicone that can suggest some manufacturers products? Or experience in the technique itself? Complete newb for casting silicone here…