Cooper-If I were doing this I would simplify the tread pattern. In this picture the mold would have some very thin sections and if prepped correctly and waxed properly it might work but if it sticks any to the small sections the mold will tear and be ruined. Here is a place that will tell you everything about the different rubbers, waxes, etc.-
http://www.smooth-on.com/Silicone-Ru...tml?catdepth=1
Good Luck