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I would strongly reccomend painting your bindings, certain paints will corrode the plastic on your bindings and also when one considers the intracacies of your bindings with all the components, do you want to risk getting paint in there. If paint was to get into any of the mechanical parts of your bindings, there is always the chance it will screw with the release of your bindings.
I am almost certain painting will void the warranty on your bindings and certain shops may be reluctant to mount them. So your resale potential will be significantly reduced.
That being said people have done it, by carefully selecting the type of paint and conver the DIN cover and all other areas of the binding they dont want painting with tape.