dont do it. it can corrode the plastic, or get inside and cause it to not function properly, thus ruining the binding. also im not 100%, but i dont know if shops are allowed to mount bindings that have been altered in any way
plus they're fuckin bindings. does it really matter if they dont match your skis?
No, but seriously I wouldn't go painting my bindings. Not only would choosing the wrong paint risk corroding the binding itself. But also if paint found itself into mechanical areas of the binding then you could risk various different mechanical binding failures; such as releasing or not releasing when the time is right for the other.