I am a corporate consultant for the parent company of Devcon
and Philadelphia resins so unfortunately I can't talk much about
recipes for grouting and bearing polymers.

I will say this though...
Doug is basically on the right track.

Don't inhale Cabosil!
Les
Leslie Watts
L M Watts Furniture
Tiger, Georgia USA
http://www.alltel.net/~leswatts/wattsfurniturewp.html
engineering page:
http://www.alltel.net/~leswatts/shop.html