Quote:
Originally Posted by Brandon Holley
I too was considering a dual pour, but it does get tricky. You are definitely going to want the outer rubber to adhere to whatever is on the inside. Otherwise the roller is just going to shred itself off. I also believe you are going to want your outer rubber to have a pretty uniform thickness along the entire roller to get the best performance (this way its actually like a "tread" on a standard wheel).
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So why not treat the outer rubber as an actual tread? Make the roller out of a hard material, and create the equivalent of a rubber slipcover that gets pulled over the roller core. Keeping the "tread" in place is a matter of appropriate engineering; I can think of several options.
Or you could form the roller core to have some overhang around small pits or slots, then pour the softer material around it. Even if it isn't adhering the same way a dual pour between highly compatible materials would, it is still mechanically secured.