I've seen them done with a latex skin but about the best way to do it is get some good high quality cold foam dreads and give them a coating of black plasti dip spray. Haven't done it myself but I've seen some amazing dreads done that way.
Hmmm, maybe some solid dread beads would do the trick. Honestly the only gentleman I knew here who made a solid rubber dread went by the username eaglewood. I couldn't tell you if he's still a member here or not but I know he made a few to see how it would go.
Ok thanks for all the info much appreciated I found a guy that does a foam latex mix on eBay from UK. He's selling 10 might give those a try if the liquid Epdm I ordered doesn't work. Let the trials begin