Guns have wood and/or super plastics close at hand and such things as skateboards use precision steel bearings in plastic moon housings with soft polyurethane just outside. I want a lube that is not only o-ring safe but has also been tested for on varieties of plastics and products.
What you seek is krytox ....
http://www2.dupont.com/Lubricants/en_US/index.html
http://en.wikipedia.org/wiki/Krytox
Small tube will last a lifetime for your skateboards and concerns you brought up in your post.... Primary use in my profession is o-rings an high tempatures . Very good product .
This is link to product I use....
Hope it helps....