Don’t paint a smoke detector you could end up damaging the sensors. Gen 1 smoke detectors have a life of 7 years while the gen 2 have a 10 year life. Swapping the CO sensor would technically allow you to extend it’s life (Provided you can find the part and can calibrate it properly) but the expiry data is programmed into the unit itself so that won’t work. Swapping the guts is one option, provided that the gen2 will fit in a gen1 case, but you risk damaging the electronics etc. Your best bet would be 3D printing a case that will fit around the new smoke detector without interrupting the air flow, light, or speaker etc.
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