I hope you are referring to taking the cover off and painting that. Even if your router doesn't have external antennas, the amount of signal loss would still be insignificant.
Lead free paint would be fine I imagine. Just ensure you don't put it on too thick as to block air vents. I would ask the paint store if they can tell you the ingredients in the paint. Anything metal could maybe be an issue but I doubt it. I was playing around with this once for fun to see what it takes to kill a signal. Even wrapping my phone in foil paper did absolutely nothing. Could still ping it and it could still receive a call. You need pretty thick metal material to block a signal.
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